131981583402 has 24 divisors (see below), whose sum is σ = 286808656836. Its totient is φ = 43863313536.

The previous prime is 131981583389. The next prime is 131981583427. The reversal of 131981583402 is 204385189131.

131981583402 is a `hidden beast` number, since 1 + 3 + 1 + 98 + 158 + 3 + 402 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 110875014441 + 21106568961 = 332979^2 + 145281^2 .

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, 10872733 + ... + 10884864.

Almost surely, 2^131981583402 is an apocalyptic number.

131981583402 is an abundant number, since it is smaller than the sum of its proper divisors (154827073434).

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

131981583402 is a wasteful number, since it uses less digits than its factorization.

131981583402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21757942 (or 21757939 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 131981583402 in words is "one hundred thirty-one billion, nine hundred eighty-one million, five hundred eighty-three thousand, four hundred two".