156857131 has 4 divisors (see below), whose sum is σ = 156891064. Its totient is φ = 156823200.

The previous prime is 156857119. The next prime is 156857137. The reversal of 156857131 is 131758651.

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

It is a cyclic number.

It is not a de Polignac number, because 156857131 - 2²⁷ = 22639403 is a prime.

It is a super-2 number, since 2×156857131² = 49208319091102322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156857137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8685 + ... + 19726.

It is an arithmetic number, because the mean of its divisors is an integer number (39222766).

Almost surely, 2^156857131 is an apocalyptic number.

156857131 is a deficient number, since it is larger than the sum of its proper divisors (33933).

156857131 is an equidigital number, since it uses as much as digits as its factorization.

156857131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33932.

The product of its digits is 25200, while the sum is 37.

The square root of 156857131 is about 12524.2616948066. The cubic root of 156857131 is about 539.3053837432.

The spelling of 156857131 in words is "one hundred fifty-six million, eight hundred fifty-seven thousand, one hundred thirty-one".