139597131 has 4 divisors (see below), whose sum is σ = 186129512. Its totient is φ = 93064752.

The previous prime is 139597111. The next prime is 139597141. The reversal of 139597131 is 131795931.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 139597131 - 2⁶ = 139597067 is a prime.

It is a super-2 number, since 2×139597131² = 38974717966862322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139597131.

It is not an unprimeable number, because it can be changed into a prime (139597111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23266186 + ... + 23266191.

It is an arithmetic number, because the mean of its divisors is an integer number (46532378).

Almost surely, 2^139597131 is an apocalyptic number.

139597131 is a deficient number, since it is larger than the sum of its proper divisors (46532381).

139597131 is an equidigital number, since it uses as much as digits as its factorization.

139597131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46532380.

The product of its digits is 25515, while the sum is 39.

The square root of 139597131 is about 11815.1229786236. The cubic root of 139597131 is about 518.7508614492.

The spelling of 139597131 in words is "one hundred thirty-nine million, five hundred ninety-seven thousand, one hundred thirty-one".