231135978 has 16 divisors (see below), whose sum is σ = 489464640. Its totient is φ = 72513216.

The previous prime is 231135959. The next prime is 231136019. The reversal of 231135978 is 879531132.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1132918 + ... + 1133121.

It is an arithmetic number, because the mean of its divisors is an integer number (30591540).

Almost surely, 2^231135978 is an apocalyptic number.

231135978 is an abundant number, since it is smaller than the sum of its proper divisors (258328662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231135978 is a wasteful number, since it uses less digits than its factorization.

231135978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2266061.

The product of its digits is 45360, while the sum is 39.

The square root of 231135978 is about 15203.1568432349. The cubic root of 231135978 is about 613.6996146917.

The spelling of 231135978 in words is "two hundred thirty-one million, one hundred thirty-five thousand, nine hundred seventy-eight".