18164689 has 2 divisors, whose sum is σ = 18164690. Its totient is φ = 18164688.

The previous prime is 18164651. The next prime is 18164719. The reversal of 18164689 is 98646181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13249600 + 4915089 = 3640^2 + 2217^2 .

It is a cyclic number.

It is not a de Polignac number, because 18164689 - 2⁷ = 18164561 is a prime.

It is not a weakly prime, because it can be changed into another prime (18164609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9082344 + 9082345.

It is an arithmetic number, because the mean of its divisors is an integer number (9082345).

Almost surely, 2^18164689 is an apocalyptic number.

It is an amenable number.

18164689 is a deficient number, since it is larger than the sum of its proper divisors (1).

18164689 is an equidigital number, since it uses as much as digits as its factorization.

18164689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 43.

The square root of 18164689 is about 4262.0052792084. The cubic root of 18164689 is about 262.8709868569.

The spelling of 18164689 in words is "eighteen million, one hundred sixty-four thousand, six hundred eighty-nine".