139 (number)

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Cardinal 139
One hundred [and] thirty-nine.
Ordinal 139th
One hundred [and] thirty-ninth.
Factorization prime
Divisors 1, 139
Roman numeral CXXXIX
Binary 10001011
Octal 213
Hexadecimal 8B

139 (One hundred [and] thirty-nine) is the natural number following 138 and preceding 140.

[edit] In mathematics

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.

[edit] In other fields

One hundred [and] thirty-nine is also:

[edit] References

  1. ^ Wells, D. The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group. (1987): 139