231915609 has 16 divisors (see below), whose sum is σ = 348709440. Its totient is φ = 152301600.

The previous prime is 231915599. The next prime is 231915611. The reversal of 231915609 is 906519132.

231915609 is a `hidden beast` number, since 2 + 3 + 1 + 91 + 560 + 9 = 666.

It is not a de Polignac number, because 231915609 - 2⁸ = 231915353 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (231915659) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 62292 + ... + 65909.

It is an arithmetic number, because the mean of its divisors is an integer number (21794340).

Almost surely, 2^231915609 is an apocalyptic number.

It is an amenable number.

231915609 is a deficient number, since it is larger than the sum of its proper divisors (116793831).

231915609 is a wasteful number, since it uses less digits than its factorization.

231915609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128277 (or 128271 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 231915609 is about 15228.7756894637. The cubic root of 231915609 is about 614.3888515357.

The spelling of 231915609 in words is "two hundred thirty-one million, nine hundred fifteen thousand, six hundred nine".