131181391872 has 156 divisors (see below), whose sum is σ = 382410268240. Its totient is φ = 43324637184.

The previous prime is 131181391829. The next prime is 131181391889. The reversal of 131181391872 is 278193181131.

131181391872 is a `hidden beast` number, since 1 + 3 + 1 + 181 + 391 + 87 + 2 = 666.

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, 4001853 + ... + 4034499.

Almost surely, 2^131181391872 is an apocalyptic number.

131181391872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131181391872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191205134120).

131181391872 is an abundant number, since it is smaller than the sum of its proper divisors (251228876368).

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

131181391872 is a wasteful number, since it uses less digits than its factorization.

131181391872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32786 (or 32761 counting only the distinct ones).

The product of its digits is 72576, while the sum is 45.

The spelling of 131181391872 in words is "one hundred thirty-one billion, one hundred eighty-one million, three hundred ninety-one thousand, eight hundred seventy-two".