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1,000,000,000
1000000000  

Cardinal 
One billion (short scale) One thousand million, or one milliard (long scale) 
Ordinal  One billionth (short scale) 
Factorization  2^{9} · 5^{9} 
Roman numeral  M 
Binary  111011100110101100101000000000_{2} 
Ternary  2120200200021010001_{3} 
Quaternary  323212230220000_{4} 
Quinary  4022000000000_{5} 
Senary  243121245344_{6} 
Octal  7346545000_{8} 
Duodecimal  23AA93854_{12} 
Hexadecimal  3B9ACA00_{16} 
Vigesimal  FCA0000_{20} 
Base 36  GJDGXS_{36} 
1,000,000,000 (one billion, short scale; one thousand million or milliard, yard,^{[1]} long scale) is the natural number following 999,999,999 and preceding 1,000,000,001.
In scientific notation, it is written as 1 × 10^{9}.
Previously in British English (but not in American English), the word "billion" referred to a million millions (1,000,000,000,000). However, this is no longer the case, and the word has been used unambiguously to mean one thousand million (1,000,000,000) for some time.^{[2]}^{[3]} The alternative term "one thousand million" is rare and is used primarily to ease understanding among nonnative speakers of English, as many other languages use words similar to "billion" (e.g. Spanish billón) to mean one trillion (1,000,000,000,000 or a million millions).
In the South Asian numbering system, it is known as 100 crore or 1 Arab.
The term milliard can also be used to refer to 1,000,000,000; whereas "milliard" is seldom used in English, variations on this name often appear in other languages (e.g. Hungarian (Magyar) milliárd, Indonesian miliar, Polish miliard, Danish milliard, Spanish millardo, French milliard, Italian miliardo, Icelandic milljarður, German Milliarde, Hebrew מיליארד, Finnish miljardi, Dutch miljard, Croatian milijarda, Serbian милијарда, Russian миллиард, Czech miliarda, Arabic مليار, Romanian miliard, Swedish miljard, Norwegian milliard, Turkish "milyar").
The SI prefix giga indicates 1,000,000,000 times the base unit.
See Orders of magnitude (numbers) for larger numbers; and long and short scales.
Selected 10digit numbers (1,000,000,000–9,999,999,999)
 1000000007 – smallest prime number with 10 digits.
 1023456789 – smallest pandigital number in base 10.
 1026753849 – smallest pandigital square that includes 0.
 1073676287 – 15th Carol number.
 1073741824 = 2^{30}
 1073807359 – 14th Kynea number.
 1129760415 – 23rd Motzkin number.
 1134903170 – 45th Fibonacci number.
 1162261467 = 3^{19}
 1220703125 = 5^{13}
 1234567890 – pandigital number with the digits in order.
 1311738121 – 25th Pell number.
 1382958545 – 15th Bell number.
 1406818759 – 30th Wedderburn–Etherington number.
 1836311903 – 46th Fibonacci number.
 1882341361 – The least prime whose reversal is both square (40391^{2}) and triangular (triangular of 57121).
 1977326743 = 7^{11}
 2147483647 – 8th Mersenne prime and the largest signed 32bit integer.
 2147483648 = 2^{31}
 2176782336 = 6^{12}
 2214502422 – 6th primary pseudoperfect number.
 2357947691 = 11^{9.}
 2971215073 – 11th Fibonacci prime (47th Fibonacci number).
 3166815962 – 26th Pell number.
 3192727797 – 24th Motzkin number.
 3323236238 – 31st Wedderburn–Etherington number.
 3405691582 – hexadecimal CAFEBABE; used as a placeholder in programming.
 3405697037 – hexadecimal CAFED00D; used as a placeholder in programming.
 3735928559 – hexadecimal DEADBEEF; used as a placeholder in programming.
 3486784401 = 3^{20}
 4294836223 – 16th Carol number.
 4294967291 – Largest prime 32bit unsigned integer.
 4294967295 – Maximum 32bit unsigned integer (hexadecimal FFFFFFFF).
 4294967296 = 2^{32}
 4294967297 – the first composite Fermat number.
 4295098367 – 15th Kynea number.
 4807526976 – 48th Fibonacci number.
 5784634181 – 13th alternating factorial.
 6103515625 = 5^{14}
 6210001000 – only selfdescriptive number in base 10.
 6227020800 = 13!.
 6975757441 = 17^{8}
 6983776800 – 15th colossally abundant number.
 7645370045 – 27th Pell number.
 7778742049 – 49th Fibonacci number.
 7862958391 – 32nd Wedderburn–Etherington number.
 8589869056 – 6th perfect number.
 8589934592 = 2^{33}
 9043402501 – 25th Motzkin number.
 9814072356 – largest square pandigital number, largest pandigital pure power.
 9876543210 – largest number without redundant digits.
 9999999967 – greatest prime number with 10 digits.^{[4]}
Sense of scale
The facts below give a sense of how large 1,000,000,000 (10^{9}) is in the context of time according to current scientific evidence:
 10^{9} seconds is 114 days short of 32 calendar years (≈ 31.7 years).
 About 10^{9} minutes ago, the Roman Empire was flourishing and Christianity was emerging. (10^{9} minutes is roughly 1,900 years.)
 About 10^{9} hours ago, modern human beings and their ancestors were living in the Stone Age (more precisely, the Middle Paleolithic). (10^{9} hours is roughly 114,000 years.)
 About 10^{9} days ago, Australopithecus, an apelike creature related to an ancestor of modern humans, roamed the African savannas. (10^{9} days is roughly 2.7 million years.)
 About 10^{9} months ago, dinosaurs walked the Earth during the late Cretaceous. (10^{9} months is roughly 82 million years.)
 About 10^{9} years—a gigaannus—ago, the first multicellular eukaryotes appeared on Earth.
 It takes approximately 95 years to count from one to one billion in a single sitting. ^{[5]}
 The universe is thought to be about 13.8 × 10^{9} years old.^{[6]}
Distance
 10^{9} inches is Script error: No such module "convert"., more than halfway around the world and thus sufficient to reach any point on the globe from any other point.
 10^{9} metres (called a gigameter) is almost three times the distance from the Earth to the Moon.
 10^{9} kilometres is over six times the distance from the Earth to the Sun.
Finance
 The possession of assets with total value of 10^{9} United States dollars would place a person among the world's wealthiest individuals.
 As visualized in a work by artist Michael Marcovici, this amount of money in stacks of hundreddollar bills can fit on twelve wrapped pallets.^{[7]}
Area
 A billion square inches would be a square about one half mile on a side.
 A piece of finely woven bed sheet cloth that contained a billion holes would measure about Script error: No such module "convert"., large enough to cover a moderate sized apartment.
Volume
 There are a billion cubic millimeters in a cubic meter.
 A billion grains of table salt or granulated sugar would occupy a volume of about Script error: No such module "convert"..
 A billion cubic inches would be a volume comparable to a large commercial building slightly larger than a typical supermarket.
Natural landscape
A small mountain, slightly larger than Stone Mountain Georgia, United States, would weigh (have a mass of) a billion tons.
Count
A is a cube; B consists of 1000 cubes of type A. C consists of 1000 Bs; and D 1000 Cs. Thus there are 1 million As in C; and 1,000,000,000 As in D.
References
 ^ http://www.investopedia.com/terms/y/yard.asp
 ^ "How many is a billion?". oxforddictionaries.com.
 ^ http://books.google.com/ngrams/graph?content=billion%2Cthousand+million%2Cmilliard&year_start=1808&year_end=2008&corpus=18&smoothing=3&share=
 ^ "greatest prime number with 10 digits". Wolfram Alpha. Retrieved July 15, 2014.
 ^ "How much is a billion?". Math Forum. Retrieved 8 May 2015.
 ^ "Cosmic Detectives". The European Space Agency (ESA). 20130402. Retrieved 20130501.
 ^ Infosthetics (20090114). One Billion Dollar (Most Expensive Artwork Ever), viewed 20100617.
