231516988 has 36 divisors (see below), whose sum is σ = 433148688. Its totient is φ = 108071040.

The previous prime is 231516979. The next prime is 231516991. The reversal of 231516988 is 889615132.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 169428 + ... + 170788.

It is an arithmetic number, because the mean of its divisors is an integer number (12031908).

Almost surely, 2^231516988 is an apocalyptic number.

It is an amenable number.

231516988 is a deficient number, since it is larger than the sum of its proper divisors (201631700).

231516988 is a wasteful number, since it uses less digits than its factorization.

231516988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1474 (or 1429 counting only the distinct ones).

The product of its digits is 103680, while the sum is 43.

The square root of 231516988 is about 15215.6823047802. The cubic root of 231516988 is about 614.0366418802.

The spelling of 231516988 in words is "two hundred thirty-one million, five hundred sixteen thousand, nine hundred eighty-eight".