231981164 has 6 divisors (see below), whose sum is σ = 405967044. Its totient is φ = 115990580.

The previous prime is 231981163. The next prime is 231981181. The reversal of 231981164 is 461189132.

231981164 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (231981161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28997642 + ... + 28997649.

It is an arithmetic number, because the mean of its divisors is an integer number (67661174).

Almost surely, 2^231981164 is an apocalyptic number.

It is an amenable number.

231981164 is a deficient number, since it is larger than the sum of its proper divisors (173985880).

231981164 is a wasteful number, since it uses less digits than its factorization.

231981164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57995295 (or 57995293 counting only the distinct ones).

The product of its digits is 10368, while the sum is 35.

The square root of 231981164 is about 15230.9278771846. The cubic root of 231981164 is about 614.4467353309.

The spelling of 231981164 in words is "two hundred thirty-one million, nine hundred eighty-one thousand, one hundred sixty-four".