139709131 has 2 divisors, whose sum is σ = 139709132. Its totient is φ = 139709130.

The previous prime is 139709117. The next prime is 139709177. The reversal of 139709131 is 131907931.

139709131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (131907931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139709131 - 2²³ = 131320523 is a prime.

It is a super-2 number, since 2×139709131² = 39037282569550322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (139709231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69854565 + 69854566.

It is an arithmetic number, because the mean of its divisors is an integer number (69854566).

Almost surely, 2^139709131 is an apocalyptic number.

139709131 is a deficient number, since it is larger than the sum of its proper divisors (1).

139709131 is an equidigital number, since it uses as much as digits as its factorization.

139709131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5103, while the sum is 34.

The square root of 139709131 is about 11819.8617166192. The cubic root of 139709131 is about 518.8895571490.

The spelling of 139709131 in words is "one hundred thirty-nine million, seven hundred nine thousand, one hundred thirty-one".