118561631 has 4 divisors (see below), whose sum is σ = 118629264. Its totient is φ = 118494000.

The previous prime is 118561609. The next prime is 118561649. The reversal of 118561631 is 136165811.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118561631 is a prime.

It is a super-2 number, since 2×118561631² = 28113720690760322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118561661) 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, 31115 + ... + 34716.

It is an arithmetic number, because the mean of its divisors is an integer number (29657316).

Almost surely, 2^118561631 is an apocalyptic number.

118561631 is a deficient number, since it is larger than the sum of its proper divisors (67633).

118561631 is an equidigital number, since it uses as much as digits as its factorization.

118561631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67632.

The product of its digits is 4320, while the sum is 32.

The square root of 118561631 is about 10888.6009661480. The cubic root of 118561631 is about 491.2637530007.

The spelling of 118561631 in words is "one hundred eighteen million, five hundred sixty-one thousand, six hundred thirty-one".