18318659 has 2 divisors, whose sum is σ = 18318660. Its totient is φ = 18318658.

The previous prime is 18318623. The next prime is 18318667. The reversal of 18318659 is 95681381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18318659 - 2¹² = 18314563 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18318689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9159329 + 9159330.

It is an arithmetic number, because the mean of its divisors is an integer number (9159330).

Almost surely, 2^18318659 is an apocalyptic number.

18318659 is a deficient number, since it is larger than the sum of its proper divisors (1).

18318659 is an equidigital number, since it uses as much as digits as its factorization.

18318659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 41.

The square root of 18318659 is about 4280.0302569024. The cubic root of 18318659 is about 263.6116257154.

The spelling of 18318659 in words is "eighteen million, three hundred eighteen thousand, six hundred fifty-nine".