131287656 has 32 divisors (see below), whose sum is σ = 328616640. Its totient is φ = 43709568.

The previous prime is 131287649. The next prime is 131287661. The reversal of 131287656 is 656782131.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20380 + ... + 26036.

It is an arithmetic number, because the mean of its divisors is an integer number (10269270).

Almost surely, 2^131287656 is an apocalyptic number.

It is an amenable number.

131287656 is an abundant number, since it is smaller than the sum of its proper divisors (197328984).

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

131287656 is a wasteful number, since it uses less digits than its factorization.

131287656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6633 (or 6629 counting only the distinct ones).

The product of its digits is 60480, while the sum is 39.

The square root of 131287656 is about 11458.0825621044. The cubic root of 131287656 is about 508.2467749300.

The spelling of 131287656 in words is "one hundred thirty-one million, two hundred eighty-seven thousand, six hundred fifty-six".