113632991 has 4 divisors (see below), whose sum is σ = 117551400. Its totient is φ = 109714584.

The previous prime is 113632973. The next prime is 113632993. The reversal of 113632991 is 199236311.

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

It is a cyclic number.

It is not a de Polignac number, because 113632991 - 2⁶ = 113632927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113632993) 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, 1959161 + ... + 1959218.

It is an arithmetic number, because the mean of its divisors is an integer number (29387850).

Almost surely, 2^113632991 is an apocalyptic number.

113632991 is a deficient number, since it is larger than the sum of its proper divisors (3918409).

113632991 is an equidigital number, since it uses as much as digits as its factorization.

113632991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3918408.

The product of its digits is 8748, while the sum is 35.

The square root of 113632991 is about 10659.8776259392. The cubic root of 113632991 is about 484.3598611765.

The spelling of 113632991 in words is "one hundred thirteen million, six hundred thirty-two thousand, nine hundred ninety-one".