131518531944 has 96 divisors (see below), whose sum is σ = 379329392520. Its totient is φ = 41022148608.

The previous prime is 131518531913. The next prime is 131518531951. The reversal of 131518531944 is 449135815131.

131518531944 is a `hidden beast` number, since 1 + 3 + 15 + 18 + 531 + 94 + 4 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 130400432100 + 1118099844 = 361110^2 + 33438^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 131518531944.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 98797 + ... + 522300.

Almost surely, 2^131518531944 is an apocalyptic number.

It is an amenable number.

131518531944 is an abundant number, since it is smaller than the sum of its proper divisors (247810860576).

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

131518531944 is a wasteful number, since it uses less digits than its factorization.

131518531944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621299 (or 621292 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The spelling of 131518531944 in words is "one hundred thirty-one billion, five hundred eighteen million, five hundred thirty-one thousand, nine hundred forty-four".