113813172981 has 48 divisors (see below), whose sum is σ = 182400895040. Its totient is φ = 70703435520.

The previous prime is 113813172971. The next prime is 113813173003. The reversal of 113813172981 is 189271318311.

113813172981 is a `hidden beast` number, since 11 + 38 + 1 + 317 + 298 + 1 = 666.

It is not a de Polignac number, because 113813172981 - 2⁶ = 113813172917 is a prime.

It is a super-2 number, since 2×113813172981² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113813172971) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 79581 + ... + 483693.

Almost surely, 2^113813172981 is an apocalyptic number.

It is an amenable number.

113813172981 is a deficient number, since it is larger than the sum of its proper divisors (68587722059).

113813172981 is an equidigital number, since it uses as much as digits as its factorization.

113813172981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404208 (or 404196 counting only the distinct ones).

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

The spelling of 113813172981 in words is "one hundred thirteen billion, eight hundred thirteen million, one hundred seventy-two thousand, nine hundred eighty-one".