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| 139 | |
|---|---|
| Cardinal | one hundred [and] thirty-nine |
| Ordinal | 139th (one hundred [and] thirty-ninth) |
| Factorization | prime |
| Prime | 34th |
| Divisors | 1, 139 |
| Roman numeral | CXXXIX |
| Binary | 100010112 |
| Octal | 2138 |
| Duodecimal | B712 |
| Hexadecimal | 8B16 |
139 (One hundred [and] thirty-nine) is the natural number following 138 and preceding 140.
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One hundred [and] thirty-nine is the 34th prime number, so it is divisible only by itself and 1. It is a twin prime with 137. Because 141 is a semiprime, 139 is a Chen prime. 139 is the smallest prime before a prime gap of length 10.[1]
This number is the sum of five consecutive prime numbers (19 + 23 + 29 + 31 + 37).
It is the smallest factor of 64079, the smallest composite Lucas number with a prime index. It is also the smallest factor of the first nine terms of the Euclid–Mullin sequence, making it the tenth term.
139 is a strictly non-palindromic number.
139 is also:
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