231972931 has 2 divisors, whose sum is σ = 231972932. Its totient is φ = 231972930.

The previous prime is 231972929. The next prime is 231972959. The reversal of 231972931 is 139279132.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231972931 - 2¹ = 231972929 is a prime.

It is a super-2 number, since 2×231972931² = 107622881433461522, which contains 22 as substring.

Together with 231972929, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (231972991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115986465 + 115986466.

It is an arithmetic number, because the mean of its divisors is an integer number (115986466).

Almost surely, 2^231972931 is an apocalyptic number.

231972931 is a deficient number, since it is larger than the sum of its proper divisors (1).

231972931 is an equidigital number, since it uses as much as digits as its factorization.

231972931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 37.

The square root of 231972931 is about 15230.6576023493. The cubic root of 231972931 is about 614.4394663502.

It can be divided in two parts, 231972 and 931, that added together give a triangular number (232903 = T₆₈₂).

The spelling of 231972931 in words is "two hundred thirty-one million, nine hundred seventy-two thousand, nine hundred thirty-one".