18445159 has 2 divisors, whose sum is σ = 18445160. Its totient is φ = 18445158.

The previous prime is 18445139. The next prime is 18445171. The reversal of 18445159 is 95154481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18445159 - 2⁵ = 18445127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18445109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9222579 + 9222580.

It is an arithmetic number, because the mean of its divisors is an integer number (9222580).

Almost surely, 2^18445159 is an apocalyptic number.

18445159 is a deficient number, since it is larger than the sum of its proper divisors (1).

18445159 is an equidigital number, since it uses as much as digits as its factorization.

18445159 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 37.

The square root of 18445159 is about 4294.7827651699. The cubic root of 18445159 is about 264.2170267356.

The spelling of 18445159 in words is "eighteen million, four hundred forty-five thousand, one hundred fifty-nine".