113173921 has 32 divisors (see below), whose sum is σ = 139242240. Its totient is φ = 89945856.

The previous prime is 113173889. The next prime is 113173927. The reversal of 113173921 is 129371311.

It is not a de Polignac number, because 113173921 - 2⁵ = 113173889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 113173921.

It is not an unprimeable number, because it can be changed into a prime (113173927) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 720775 + ... + 720931.

It is an arithmetic number, because the mean of its divisors is an integer number (4351320).

Almost surely, 2^113173921 is an apocalyptic number.

It is an amenable number.

113173921 is a deficient number, since it is larger than the sum of its proper divisors (26068319).

113173921 is a wasteful number, since it uses less digits than its factorization.

113173921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313.

The product of its digits is 1134, while the sum is 28.

The square root of 113173921 is about 10638.3232231400. The cubic root of 113173921 is about 483.7067199048.

It can be divided in two parts, 1131739 and 21, that added together give a triangular number (1131760 = T₁₅₀₄).

The spelling of 113173921 in words is "one hundred thirteen million, one hundred seventy-three thousand, nine hundred twenty-one".