139 | |
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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: