231956931 has 4 divisors (see below), whose sum is σ = 309275912. Its totient is φ = 154637952.

The previous prime is 231956887. The next prime is 231956939. The reversal of 231956931 is 139659132.

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

It is not a de Polignac number, because 231956931 - 2⁶ = 231956867 is a prime.

It is a super-2 number, since 2×231956931² = 107608035677877522, 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 231956931.

It is not an unprimeable number, because it can be changed into a prime (231956939) 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, 38659486 + ... + 38659491.

It is an arithmetic number, because the mean of its divisors is an integer number (77318978).

Almost surely, 2^231956931 is an apocalyptic number.

231956931 is a deficient number, since it is larger than the sum of its proper divisors (77318981).

231956931 is an equidigital number, since it uses as much as digits as its factorization.

231956931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77318980.

The product of its digits is 43740, while the sum is 39.

The square root of 231956931 is about 15230.1323369168. The cubic root of 231956931 is about 614.4253393319.

The spelling of 231956931 in words is "two hundred thirty-one million, nine hundred fifty-six thousand, nine hundred thirty-one".