231111113031 has 64 divisors (see below), whose sum is σ = 357887808000. Its totient is φ = 147300215040.

The previous prime is 231111113027. The next prime is 231111113041. The reversal of 231111113031 is 130311111132.

It is not a de Polignac number, because 231111113031 - 2² = 231111113027 is a prime.

It is a super-2 number, since 2×231111113031² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231111112995 and 231111113013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231111113041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8635036 + ... + 8661758.

It is an arithmetic number, because the mean of its divisors is an integer number (5591997000).

Almost surely, 2^231111113031 is an apocalyptic number.

231111113031 is a deficient number, since it is larger than the sum of its proper divisors (126776694969).

231111113031 is a wasteful number, since it uses less digits than its factorization.

231111113031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26941 (or 26935 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

Adding to 231111113031 its reverse (130311111132), we get a palindrome (361422224163).

The spelling of 231111113031 in words is "two hundred thirty-one billion, one hundred eleven million, one hundred thirteen thousand, thirty-one".