18512243 has 2 divisors, whose sum is σ = 18512244. Its totient is φ = 18512242.

The previous prime is 18512227. The next prime is 18512261. The reversal of 18512243 is 34221581.

It is a weak prime.

It is an emirp because it is prime and its reverse (34221581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18512243 - 2⁴ = 18512227 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18512203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9256121 + 9256122.

It is an arithmetic number, because the mean of its divisors is an integer number (9256122).

Almost surely, 2^18512243 is an apocalyptic number.

18512243 is a deficient number, since it is larger than the sum of its proper divisors (1).

18512243 is an equidigital number, since it uses as much as digits as its factorization.

18512243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 26.

The square root of 18512243 is about 4302.5856179744. The cubic root of 18512243 is about 264.5369533241.

The spelling of 18512243 in words is "eighteen million, five hundred twelve thousand, two hundred forty-three".