113612161 has 4 divisors (see below), whose sum is σ = 122351572. Its totient is φ = 104872752.

The previous prime is 113612137. The next prime is 113612171. The reversal of 113612161 is 161216311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161216311 = 19 ⋅8485069.

It can be written as a sum of positive squares in 2 ways, for example, as 9265936 + 104346225 = 3044^2 + 10215^2 .

It is a cyclic number.

It is not a de Polignac number, because 113612161 - 2⁵ = 113612129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (113612131) 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, 4369686 + ... + 4369711.

It is an arithmetic number, because the mean of its divisors is an integer number (30587893).

Almost surely, 2^113612161 is an apocalyptic number.

It is an amenable number.

113612161 is a deficient number, since it is larger than the sum of its proper divisors (8739411).

113612161 is an equidigital number, since it uses as much as digits as its factorization.

113612161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8739410.

The product of its digits is 216, while the sum is 22.

The square root of 113612161 is about 10658.9005530589. The cubic root of 113612161 is about 484.3302634562.

Adding to 113612161 its reverse (161216311), we get a palindrome (274828472).

The spelling of 113612161 in words is "one hundred thirteen million, six hundred twelve thousand, one hundred sixty-one".