18164331 has 10 divisors (see below), whose sum is σ = 27134492. Its totient is φ = 12109500.

The previous prime is 18164281. The next prime is 18164339. The reversal of 18164331 is 13346181.

18164331 is a `hidden beast` number, since 18 + 1 + 643 + 3 + 1 = 666.

It is not a de Polignac number, because 18164331 - 2¹¹ = 18162283 is a prime.

It is a super-2 number, since 2×18164331² = 659885841355122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18164295 and 18164304.

It is not an unprimeable number, because it can be changed into a prime (18164339) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 112045 + ... + 112206.

Almost surely, 2^18164331 is an apocalyptic number.

18164331 is a deficient number, since it is larger than the sum of its proper divisors (8970161).

18164331 is an equidigital number, since it uses as much as digits as its factorization.

18164331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224263 (or 224254 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 18164331 is about 4261.9632799920. The cubic root of 18164331 is about 262.8692599087.

The spelling of 18164331 in words is "eighteen million, one hundred sixty-four thousand, three hundred thirty-one".