131981680 has 20 divisors (see below), whose sum is σ = 306857592. Its totient is φ = 52792640.

The previous prime is 131981677. The next prime is 131981711. The reversal of 131981680 is 86189131.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 824806 + ... + 824965.

Almost surely, 2^131981680 is an apocalyptic number.

131981680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131981680 is an abundant number, since it is smaller than the sum of its proper divisors (174875912).

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

131981680 is a wasteful number, since it uses less digits than its factorization.

131981680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1649784 (or 1649778 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 131981680 is about 11488.3279897468. The cubic root of 131981680 is about 509.1407805967.

It can be divided in two parts, 13198 and 1680, that added together give a triangular number (14878 = T₁₇₂).

The spelling of 131981680 in words is "one hundred thirty-one million, nine hundred eighty-one thousand, six hundred eighty".