231131031 has 16 divisors (see below), whose sum is σ = 326610144. Its totient is φ = 144886784.

The previous prime is 231130973. The next prime is 231131041. The reversal of 231131031 is 130131132.

It is not a de Polignac number, because 231131031 - 2¹⁴ = 231114647 is a prime.

It is a super-2 number, since 2×231131031² = 106843106982245922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231131031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231131041) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 99475 + ... + 101771.

It is an arithmetic number, because the mean of its divisors is an integer number (20413134).

Almost surely, 2^231131031 is an apocalyptic number.

231131031 is a deficient number, since it is larger than the sum of its proper divisors (95479113).

231131031 is a wasteful number, since it uses less digits than its factorization.

231131031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4290.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 231131031 is about 15202.9941458911. The cubic root of 231131031 is about 613.6952363258.

Adding to 231131031 its reverse (130131132), we get a palindrome (361262163).

The spelling of 231131031 in words is "two hundred thirty-one million, one hundred thirty-one thousand, thirty-one".