231518990 has 32 divisors (see below), whose sum is σ = 450537120. Its totient is φ = 85359744.

The previous prime is 231518981. The next prime is 231519007. The reversal of 231518990 is 99815132.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9437 + ... + 23496.

It is an arithmetic number, because the mean of its divisors is an integer number (14079285).

Almost surely, 2^231518990 is an apocalyptic number.

231518990 is a deficient number, since it is larger than the sum of its proper divisors (219018130).

231518990 is a wasteful number, since it uses less digits than its factorization.

231518990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32996.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 231518990 is about 15215.7480920262. The cubic root of 231518990 is about 614.0384117976.

The spelling of 231518990 in words is "two hundred thirty-one million, five hundred eighteen thousand, nine hundred ninety".