113642161 has 4 divisors (see below), whose sum is σ = 120327012. Its totient is φ = 106957312.

The previous prime is 113642131. The next prime is 113642167. The reversal of 113642161 is 161246311.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 89189136 + 24453025 = 9444^2 + 4945^2 .

It is a cyclic number.

It is not a de Polignac number, because 113642161 - 2⁷ = 113642033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (113642167) 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, 3342400 + ... + 3342433.

It is an arithmetic number, because the mean of its divisors is an integer number (30081753).

Almost surely, 2^113642161 is an apocalyptic number.

It is an amenable number.

113642161 is a deficient number, since it is larger than the sum of its proper divisors (6684851).

113642161 is an equidigital number, since it uses as much as digits as its factorization.

113642161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6684850.

The product of its digits is 864, while the sum is 25.

The square root of 113642161 is about 10660.3077347701. The cubic root of 113642161 is about 484.3728898472.

Adding to 113642161 its reverse (161246311), we get a palindrome (274888472).

The spelling of 113642161 in words is "one hundred thirteen million, six hundred forty-two thousand, one hundred sixty-one".