231566464 has 16 divisors (see below), whose sum is σ = 461324070. Its totient is φ = 115783168.

The previous prime is 231566453. The next prime is 231566501. The reversal of 231566464 is 464665132.

It can be written as a sum of positive squares in only one way, i.e., 215502400 + 16064064 = 14680^2 + 4008^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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, 904429 + ... + 904684.

Almost surely, 2^231566464 is an apocalyptic number.

It is an amenable number.

231566464 is a deficient number, since it is larger than the sum of its proper divisors (229757606).

231566464 is an equidigital number, since it uses as much as digits as its factorization.

231566464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1809127 (or 1809115 counting only the distinct ones).

The product of its digits is 103680, while the sum is 37.

The square root of 231566464 is about 15217.3080405175. The cubic root of 231566464 is about 614.0803793662.

The spelling of 231566464 in words is "two hundred thirty-one million, five hundred sixty-six thousand, four hundred sixty-four".