231131118 has 16 divisors (see below), whose sum is σ = 462896640. Its totient is φ = 76937976.

The previous prime is 231131111. The next prime is 231131123. The reversal of 231131118 is 811131132.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 231131094 and 231131103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231131111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21630 + ... + 30497.

It is an arithmetic number, because the mean of its divisors is an integer number (28931040).

Almost surely, 2^231131118 is an apocalyptic number.

231131118 is an abundant number, since it is smaller than the sum of its proper divisors (231765522).

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

231131118 is a wasteful number, since it uses less digits than its factorization.

231131118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52871.

The product of its digits is 144, while the sum is 21.

The square root of 231131118 is about 15202.9970071693. The cubic root of 231131118 is about 613.6953133261.

The spelling of 231131118 in words is "two hundred thirty-one million, one hundred thirty-one thousand, one hundred eighteen".