231569231 has 2 divisors, whose sum is σ = 231569232. Its totient is φ = 231569230.

The previous prime is 231569227. The next prime is 231569249. The reversal of 231569231 is 132965132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231569231 - 2² = 231569227 is a prime.

It is a super-2 number, since 2×231569231² = 107248617491862722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231569281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115784615 + 115784616.

It is an arithmetic number, because the mean of its divisors is an integer number (115784616).

Almost surely, 2^231569231 is an apocalyptic number.

231569231 is a deficient number, since it is larger than the sum of its proper divisors (1).

231569231 is an equidigital number, since it uses as much as digits as its factorization.

231569231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 32.

The square root of 231569231 is about 15217.3989564577. The cubic root of 231569231 is about 614.0828252495.

The spelling of 231569231 in words is "two hundred thirty-one million, five hundred sixty-nine thousand, two hundred thirty-one".