113168981 has 4 divisors (see below), whose sum is σ = 113505132. Its totient is φ = 112832832.

The previous prime is 113168971. The next prime is 113168989. The reversal of 113168981 is 189861311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 189861311 = 197 ⋅963763.

It can be written as a sum of positive squares in 2 ways, for example, as 27772900 + 85396081 = 5270^2 + 9241^2 .

It is a cyclic number.

It is not a de Polignac number, because 113168981 - 2⁶ = 113168917 is a prime.

It is a super-2 number, since 2×113168981² = 25614436521156722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113168989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167570 + ... + 168243.

It is an arithmetic number, because the mean of its divisors is an integer number (28376283).

Almost surely, 2^113168981 is an apocalyptic number.

It is an amenable number.

113168981 is a deficient number, since it is larger than the sum of its proper divisors (336151).

113168981 is an equidigital number, since it uses as much as digits as its factorization.

113168981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336150.

The product of its digits is 10368, while the sum is 38.

The square root of 113168981 is about 10638.0910411596. The cubic root of 113168981 is about 483.6996819289.

The spelling of 113168981 in words is "one hundred thirteen million, one hundred sixty-eight thousand, nine hundred eighty-one".