231657564 has 36 divisors (see below), whose sum is σ = 565073096. Its totient is φ = 73859808.

The previous prime is 231657551. The next prime is 231657581. The reversal of 231657564 is 465756132.

231657564 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11899 + ... + 24594.

Almost surely, 2^231657564 is an apocalyptic number.

It is an amenable number.

231657564 is an abundant number, since it is smaller than the sum of its proper divisors (333415532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231657564 is a wasteful number, since it uses less digits than its factorization.

231657564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36546 (or 36521 counting only the distinct ones).

The product of its digits is 151200, while the sum is 39.

The square root of 231657564 is about 15220.3010482710. The cubic root of 231657564 is about 614.1608967651.

It can be divided in two parts, 231657 and 564, that added together give a triangular number (232221 = T₆₈₁).

The spelling of 231657564 in words is "two hundred thirty-one million, six hundred fifty-seven thousand, five hundred sixty-four".