231918312 has 32 divisors (see below), whose sum is σ = 582842880. Its totient is φ = 76899840.

The previous prime is 231918293. The next prime is 231918353. The reversal of 231918312 is 213819132.

It is a super-2 number, since 2×231918312² = 107572206881858688, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231918312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20713 + ... + 29880.

It is an arithmetic number, because the mean of its divisors is an integer number (18213840).

Almost surely, 2^231918312 is an apocalyptic number.

It is an amenable number.

231918312 is an abundant number, since it is smaller than the sum of its proper divisors (350924568).

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

231918312 is a wasteful number, since it uses less digits than its factorization.

231918312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50793 (or 50789 counting only the distinct ones).

The product of its digits is 2592, while the sum is 30.

The square root of 231918312 is about 15228.8644356695. The cubic root of 231918312 is about 614.3912384479.

The spelling of 231918312 in words is "two hundred thirty-one million, nine hundred eighteen thousand, three hundred twelve".