1,000,000,000
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| Cardinal | One billion |
| Ordinal | Billionth or One billionth |
| Factorization | |
| Greek numeral | Expression error: Unrecognized punctuation character ",". |
| Roman numeral | Expression error: Unrecognized punctuation character ",". |
| Binary | Expression error: Unrecognized punctuation character ",". |
| Ternary | Expression error: Unrecognized punctuation character ",". |
| Senary | Expression error: Unrecognized punctuation character ",". |
| Octal | Expression error: Unrecognized punctuation character ",". |
| Duodecimal | Expression error: Unrecognized punctuation character ",". |
| Hexadecimal | Expression error: Unrecognized punctuation character ",". |
One thousand million (1,000,000,000) is the natural number following 999999999 and preceding 1000000001. (It is usually called a "billion" or a "thousand million". A "Milliard" can also be used to refer to 1,000,000,000, though is very much rarer).
In scientific notation, it is written as 109. Physical quantities can be expressed using the SI prefix giga.
See Orders of magnitude (numbers) for larger numbers.
Selected 10-digit numbers (1000000001 - 9999999999)
- 1023456789 - smallest pandigital number
- 1073676287 - Carol number
- 1073807359 - Kynea number
- 1111111111 - repunit
- 1129760415 - Motzkin number
- 1134903170 - Fibonacci number
- 1162261467 = 3^19
- 1220703125 = 5^12
- 1234567890 - pandigital number with the digits in order
- 1311738121 - Pell number
- 1382958545 - Bell number
- 1406818759 - Wedderburn-Etherington number
- 1836311903 - Fibonacci prime
- 2222222222 - repdigit
- 2971215073 - Fibonacci prime
- 3166815962 - Pell number
- 3192727797 - Motzkin number
- 3323236238 - Wedderburn-Etherington number
- 3333333333 - repdigit
- 3486784401 = 3^20
- 4294836223 - Carol number
- 4295098367 - Kynea number
- 4444444444 - repdigit
- 4807526976 - Fibonacci number
- 5555555555 - repdigit
- 5784634181 - alternating factorial
- 6210001000 - the only self-descriptive number in base 10
- 6227020800 = 13!
- 6666666666 - repdigit
- 7645370045 - Pell number
- 7777777777 - repdigit
- 7778742049 - Fibonacci number
- 7862958391 - Wedderburn-Etherington number
- 8888888888 - repdigit
- 9043402501 - Motzkin number
- 9814072356 - largest square pandigital number, largest pandigital pure power
- 9876543210 - largest pandigital number without redundant digits
- 9999999999 - repdigit