131609256 has 16 divisors (see below), whose sum is σ = 329023200. Its totient is φ = 43869744.

The previous prime is 131609237. The next prime is 131609273. The reversal of 131609256 is 652906131.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2741836 + ... + 2741883.

It is an arithmetic number, because the mean of its divisors is an integer number (20563950).

Almost surely, 2^131609256 is an apocalyptic number.

It is an amenable number.

131609256 is an abundant number, since it is smaller than the sum of its proper divisors (197413944).

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

131609256 is a wasteful number, since it uses less digits than its factorization.

131609256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5483728 (or 5483724 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 131609256 is about 11472.1077400798. The cubic root of 131609256 is about 508.6614340735.

The spelling of 131609256 in words is "one hundred thirty-one million, six hundred nine thousand, two hundred fifty-six".