131711931 has 24 divisors (see below), whose sum is σ = 205951200. Its totient is φ = 80631936.

The previous prime is 131711927. The next prime is 131711969. The reversal of 131711931 is 139117131.

It is not a de Polignac number, because 131711931 - 2² = 131711927 is a prime.

It is a super-2 number, since 2×131711931² = 34696065535497522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 131711895 and 131711904.

It is not an unprimeable number, because it can be changed into a prime (131711981) 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, 20455 + ... + 26111.

It is an arithmetic number, because the mean of its divisors is an integer number (8581300).

Almost surely, 2^131711931 is an apocalyptic number.

131711931 is a deficient number, since it is larger than the sum of its proper divisors (74239269).

131711931 is a wasteful number, since it uses less digits than its factorization.

131711931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5875 (or 5872 counting only the distinct ones).

The product of its digits is 567, while the sum is 27.

The square root of 131711931 is about 11476.5818517536. The cubic root of 131711931 is about 508.7936771457.

The spelling of 131711931 in words is "one hundred thirty-one million, seven hundred eleven thousand, nine hundred thirty-one".