231169978 has 32 divisors (see below), whose sum is σ = 404623296. Its totient is φ = 98074368.

The previous prime is 231169973. The next prime is 231169993. The reversal of 231169978 is 879961132.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (231169973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12925 + ... + 25087.

It is an arithmetic number, because the mean of its divisors is an integer number (12644478).

Almost surely, 2^231169978 is an apocalyptic number.

231169978 is a deficient number, since it is larger than the sum of its proper divisors (173453318).

231169978 is a wasteful number, since it uses less digits than its factorization.

231169978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12238.

The product of its digits is 163296, while the sum is 46.

The square root of 231169978 is about 15204.2749909359. The cubic root of 231169978 is about 613.7297048636.

The spelling of 231169978 in words is "two hundred thirty-one million, one hundred sixty-nine thousand, nine hundred seventy-eight".