18116631 has 36 divisors (see below), whose sum is σ = 29099928. Its totient is φ = 10850112.

The previous prime is 18116597. The next prime is 18116653. The reversal of 18116631 is 13661181.

18116631 is a `hidden beast` number, since 18 + 1 + 16 + 631 = 666.

It is not a de Polignac number, because 18116631 - 2¹³ = 18108439 is a prime.

It is a super-2 number, since 2×18116631² = 656424637580322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18116595 and 18116604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18116531) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 65265 + ... + 65541.

Almost surely, 2^18116631 is an apocalyptic number.

18116631 is a deficient number, since it is larger than the sum of its proper divisors (10983297).

18116631 is a wasteful number, since it uses less digits than its factorization.

18116631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352 (or 336 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 18116631 is about 4256.3635887927. The cubic root of 18116631 is about 262.6389577205.

The spelling of 18116631 in words is "eighteen million, one hundred sixteen thousand, six hundred thirty-one".