18494519 has 2 divisors, whose sum is σ = 18494520. Its totient is φ = 18494518.

The previous prime is 18494513. The next prime is 18494527. The reversal of 18494519 is 91549481.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18494519 - 2⁴ = 18494503 is a prime.

It is a super-2 number, since 2×18494519² = 684094466082722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18494513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9247259 + 9247260.

It is an arithmetic number, because the mean of its divisors is an integer number (9247260).

Almost surely, 2^18494519 is an apocalyptic number.

18494519 is a deficient number, since it is larger than the sum of its proper divisors (1).

18494519 is an equidigital number, since it uses as much as digits as its factorization.

18494519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 41.

The square root of 18494519 is about 4300.5254330140. The cubic root of 18494519 is about 264.4525020038.

The spelling of 18494519 in words is "eighteen million, four hundred ninety-four thousand, five hundred nineteen".