131939731 has 12 divisors (see below), whose sum is σ = 165743536. Its totient is φ = 102809520.

The previous prime is 131939713. The next prime is 131939747. The reversal of 131939731 is 137939131.

It is a de Polignac number, because none of the positive numbers 2^k-131939731 is a prime.

It is a super-2 number, since 2×131939731² = 34816185232704722, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (131939701) 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, 77040 + ... + 78733.

Almost surely, 2^131939731 is an apocalyptic number.

131939731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

131939731 is a deficient number, since it is larger than the sum of its proper divisors (33803805).

131939731 is a wasteful number, since it uses less digits than its factorization.

131939731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155802 (or 155791 counting only the distinct ones).

The product of its digits is 15309, while the sum is 37.

The square root of 131939731 is about 11486.5021220561. The cubic root of 131939731 is about 509.0868331857.

The spelling of 131939731 in words is "one hundred thirty-one million, nine hundred thirty-nine thousand, seven hundred thirty-one".