18513023 has 2 divisors, whose sum is σ = 18513024. Its totient is φ = 18513022.

The previous prime is 18512981. The next prime is 18513029. The reversal of 18513023 is 32031581.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18513023 - 2¹² = 18508927 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18513023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18513029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9256511 + 9256512.

It is an arithmetic number, because the mean of its divisors is an integer number (9256512).

Almost surely, 2^18513023 is an apocalyptic number.

18513023 is a deficient number, since it is larger than the sum of its proper divisors (1).

18513023 is an equidigital number, since it uses as much as digits as its factorization.

18513023 is an evil number, because the sum of its binary digits is even.

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

The square root of 18513023 is about 4302.6762601897. The cubic root of 18513023 is about 264.5406686298.

The spelling of 18513023 in words is "eighteen million, five hundred thirteen thousand, twenty-three".