131665056 has 24 divisors (see below), whose sum is σ = 345621024. Its totient is φ = 43888320.

The previous prime is 131665021. The next prime is 131665057. The reversal of 131665056 is 650566131.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (131665057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 685660 + ... + 685851.

It is an arithmetic number, because the mean of its divisors is an integer number (14400876).

Almost surely, 2^131665056 is an apocalyptic number.

131665056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

131665056 is an abundant number, since it is smaller than the sum of its proper divisors (213955968).

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

131665056 is a wasteful number, since it uses less digits than its factorization.

131665056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371524 (or 1371516 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 131665056 is about 11474.5394678828. The cubic root of 131665056 is about 508.7333117374.

The spelling of 131665056 in words is "one hundred thirty-one million, six hundred sixty-five thousand, fifty-six".