113991641 has 4 divisors (see below), whose sum is σ = 114178212. Its totient is φ = 113805072.

The previous prime is 113991607. The next prime is 113991643. The reversal of 113991641 is 146199311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 146199311 = 181 ⋅807731.

It can be written as a sum of positive squares in 2 ways, for example, as 56550400 + 57441241 = 7520^2 + 7579^2 .

It is a cyclic number.

It is not a de Polignac number, because 113991641 - 2²⁶ = 46882777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (113991643) 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, 92366 + ... + 93591.

It is an arithmetic number, because the mean of its divisors is an integer number (28544553).

Almost surely, 2^113991641 is an apocalyptic number.

It is an amenable number.

113991641 is a deficient number, since it is larger than the sum of its proper divisors (186571).

113991641 is an equidigital number, since it uses as much as digits as its factorization.

113991641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186570.

The product of its digits is 5832, while the sum is 35.

The square root of 113991641 is about 10676.6867988154. The cubic root of 113991641 is about 484.8689070713.

The spelling of 113991641 in words is "one hundred thirteen million, nine hundred ninety-one thousand, six hundred forty-one".