231531648 has 32 divisors (see below), whose sum is σ = 615006960. Its totient is φ = 77177088.

The previous prime is 231531647. The next prime is 231531659. The reversal of 231531648 is 846135132.

It is a tau number, because it is divible by the number of its divisors (32).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (231531647) 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, 301090 + ... + 301857.

Almost surely, 2^231531648 is an apocalyptic number.

It is an amenable number.

231531648 is an abundant number, since it is smaller than the sum of its proper divisors (383475312).

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

231531648 is an equidigital number, since it uses as much as digits as its factorization.

231531648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602964 (or 602952 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 231531648 is about 15216.1640369707. The cubic root of 231531648 is about 614.0496021778.

The spelling of 231531648 in words is "two hundred thirty-one million, five hundred thirty-one thousand, six hundred forty-eight".