131111931 has 4 divisors (see below), whose sum is σ = 174815912. Its totient is φ = 87407952.

The previous prime is 131111923. The next prime is 131111963. The reversal of 131111931 is 139111131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 139111131 = 3 ⋅46370377.

It is not a de Polignac number, because 131111931 - 2³ = 131111923 is a prime.

It is a super-2 number, since 2×131111931² = 34380676901097522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131111898 and 131111907.

It is not an unprimeable number, because it can be changed into a prime (131111921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21851986 + ... + 21851991.

It is an arithmetic number, because the mean of its divisors is an integer number (43703978).

Almost surely, 2^131111931 is an apocalyptic number.

131111931 is a deficient number, since it is larger than the sum of its proper divisors (43703981).

131111931 is an equidigital number, since it uses as much as digits as its factorization.

131111931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43703980.

The product of its digits is 81, while the sum is 21.

The square root of 131111931 is about 11450.4118266550. The cubic root of 131111931 is about 508.0199154674.

The spelling of 131111931 in words is "one hundred thirty-one million, one hundred eleven thousand, nine hundred thirty-one".