231538130 has 48 divisors (see below), whose sum is σ = 447274440. Its totient is φ = 86274048.

The previous prime is 231538093. The next prime is 231538169. The reversal of 231538130 is 31835132.

It can be written as a sum of positive squares in 12 ways, for example, as 1682209 + 229855921 = 1297^2 + 15161^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 231538130.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 326216 + ... + 326924.

Almost surely, 2^231538130 is an apocalyptic number.

231538130 is a deficient number, since it is larger than the sum of its proper divisors (215736310).

231538130 is a wasteful number, since it uses less digits than its factorization.

231538130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863 (or 846 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 231538130 is about 15216.3770326579. The cubic root of 231538130 is about 614.0553324706.

The spelling of 231538130 in words is "two hundred thirty-one million, five hundred thirty-eight thousand, one hundred thirty".