131999256 has 48 divisors (see below), whose sum is σ = 364253760. Its totient is φ = 43168320.

The previous prime is 131999233. The next prime is 131999261. The reversal of 131999256 is 652999131.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13480 + ... + 21111.

It is an arithmetic number, because the mean of its divisors is an integer number (7588620).

Almost surely, 2^131999256 is an apocalyptic number.

It is an amenable number.

131999256 is an abundant number, since it is smaller than the sum of its proper divisors (232254504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131999256 is a wasteful number, since it uses less digits than its factorization.

131999256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34656 (or 34649 counting only the distinct ones).

The product of its digits is 131220, while the sum is 45.

The square root of 131999256 is about 11489.0929145864. The cubic root of 131999256 is about 509.1633803524.

The spelling of 131999256 in words is "one hundred thirty-one million, nine hundred ninety-nine thousand, two hundred fifty-six".