113431031 has 12 divisors (see below), whose sum is σ = 132259608. Its totient is φ = 96998832.

The previous prime is 113431013. The next prime is 113431039. The reversal of 113431031 is 130134311.

It is not a de Polignac number, because 113431031 - 2¹⁰ = 113430007 is a prime.

It is a super-2 number, since 2×113431031² = 25733197587445922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113431039) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20405 + ... + 25361.

It is an arithmetic number, because the mean of its divisors is an integer number (11021634).

Almost surely, 2^113431031 is an apocalyptic number.

113431031 is a deficient number, since it is larger than the sum of its proper divisors (18828577).

113431031 is an equidigital number, since it uses as much as digits as its factorization.

113431031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5438 (or 5431 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 113431031 is about 10650.4005089011. The cubic root of 113431031 is about 484.0727399610.

Adding to 113431031 its reverse (130134311), we get a palindrome (243565342).

The spelling of 113431031 in words is "one hundred thirteen million, four hundred thirty-one thousand, thirty-one".