131788731 has 32 divisors (see below), whose sum is σ = 194630400. Its totient is φ = 78986880.

The previous prime is 131788721. The next prime is 131788747. The reversal of 131788731 is 137887131.

It is not a de Polignac number, because 131788731 - 2²² = 127594427 is a prime.

It is a super-2 number, since 2×131788731² = 34736539237180722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 131788731.

It is not an unprimeable number, because it can be changed into a prime (131788721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100180 + ... + 101486.

It is an arithmetic number, because the mean of its divisors is an integer number (6082200).

Almost surely, 2^131788731 is an apocalyptic number.

131788731 is a deficient number, since it is larger than the sum of its proper divisors (62841669).

131788731 is a wasteful number, since it uses less digits than its factorization.

131788731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1419.

The product of its digits is 28224, while the sum is 39.

The square root of 131788731 is about 11479.9273081322. The cubic root of 131788731 is about 508.8925488823.

The spelling of 131788731 in words is "one hundred thirty-one million, seven hundred eighty-eight thousand, seven hundred thirty-one".