18090563 has 2 divisors, whose sum is σ = 18090564. Its totient is φ = 18090562.

The previous prime is 18090557. The next prime is 18090607. The reversal of 18090563 is 36509081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18090563 - 2⁴ = 18090547 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18090263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9045281 + 9045282.

It is an arithmetic number, because the mean of its divisors is an integer number (9045282).

Almost surely, 2^18090563 is an apocalyptic number.

18090563 is a deficient number, since it is larger than the sum of its proper divisors (1).

18090563 is an equidigital number, since it uses as much as digits as its factorization.

18090563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 18090563 is about 4253.3002480427. The cubic root of 18090563 is about 262.5129269522.

The spelling of 18090563 in words is "eighteen million, ninety thousand, five hundred sixty-three".