118918431 has 6 divisors (see below), whose sum is σ = 171771080. Its totient is φ = 79278948.

The previous prime is 118918421. The next prime is 118918439. The reversal of 118918431 is 134819811.

It is not a de Polignac number, because 118918431 - 2²¹ = 116821279 is a prime.

It is a super-2 number, since 2×118918431² = 28283186463003522, 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 (118918439) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6606571 + ... + 6606588.

Almost surely, 2^118918431 is an apocalyptic number.

118918431 is a deficient number, since it is larger than the sum of its proper divisors (52852649).

118918431 is a wasteful number, since it uses less digits than its factorization.

118918431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13213165 (or 13213162 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 118918431 is about 10904.9727647528. The cubic root of 118918431 is about 491.7560633896.

The spelling of 118918431 in words is "one hundred eighteen million, nine hundred eighteen thousand, four hundred thirty-one".