131231120031 has 24 divisors (see below), whose sum is σ = 213697452080. Its totient is φ = 79534010160.

The previous prime is 131231120021. The next prime is 131231120113. The reversal of 131231120031 is 130021132131.

It is not a de Polignac number, because 131231120031 - 2⁶ = 131231119967 is a prime.

It is a super-2 number, since 2×131231120031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131231119986 and 131231120013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131231120021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20081080 + ... + 20087613.

Almost surely, 2^131231120031 is an apocalyptic number.

131231120031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

131231120031 is a deficient number, since it is larger than the sum of its proper divisors (82466332049).

131231120031 is a wasteful number, since it uses less digits than its factorization.

131231120031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40168724 (or 40168707 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 131231120031 its reverse (130021132131), we get a palindrome (261252252162).

The spelling of 131231120031 in words is "one hundred thirty-one billion, two hundred thirty-one million, one hundred twenty thousand, thirty-one".