18315023 has 2 divisors, whose sum is σ = 18315024. Its totient is φ = 18315022.

The previous prime is 18315019. The next prime is 18315049. The reversal of 18315023 is 32051381.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18315023 - 2² = 18315019 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18315023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18315013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9157511 + 9157512.

It is an arithmetic number, because the mean of its divisors is an integer number (9157512).

Almost surely, 2^18315023 is an apocalyptic number.

18315023 is a deficient number, since it is larger than the sum of its proper divisors (1).

18315023 is an equidigital number, since it uses as much as digits as its factorization.

18315023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 18315023 is about 4279.6054724706. The cubic root of 18315023 is about 263.5941834763.

The spelling of 18315023 in words is "eighteen million, three hundred fifteen thousand, twenty-three".