131979856 has 10 divisors (see below), whose sum is σ = 255711002. Its totient is φ = 65989920.

The previous prime is 131979847. The next prime is 131979917. The reversal of 131979856 is 658979131.

It can be written as a sum of positive squares in only one way, i.e., 121352256 + 10627600 = 11016^2 + 3260^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4124355 + ... + 4124386.

Almost surely, 2^131979856 is an apocalyptic number.

131979856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

131979856 is a deficient number, since it is larger than the sum of its proper divisors (123731146).

131979856 is an equidigital number, since it uses as much as digits as its factorization.

131979856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8248749 (or 8248743 counting only the distinct ones).

The product of its digits is 408240, while the sum is 49.

The square root of 131979856 is about 11488.2486045524. The cubic root of 131979856 is about 509.1384351271.

The spelling of 131979856 in words is "one hundred thirty-one million, nine hundred seventy-nine thousand, eight hundred fifty-six".