918920631 has 16 divisors (see below), whose sum is σ = 1269352448. Its totient is φ = 590695200.

The previous prime is 918920627. The next prime is 918920647. The reversal of 918920631 is 136029819.

It is not a de Polignac number, because 918920631 - 2² = 918920627 is a prime.

It is a super-2 number, since 2×918920631² = 1688830252154876322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 918920631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (918920231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7926 + ... + 43596.

It is an arithmetic number, because the mean of its divisors is an integer number (79334528).

Almost surely, 2^918920631 is an apocalyptic number.

918920631 is a deficient number, since it is larger than the sum of its proper divisors (350431817).

918920631 is a wasteful number, since it uses less digits than its factorization.

918920631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35982.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 918920631 is about 30313.7036833179. The cubic root of 918920631 is about 972.2083214939.

The spelling of 918920631 in words is "nine hundred eighteen million, nine hundred twenty thousand, six hundred thirty-one".