18539099 has 2 divisors, whose sum is σ = 18539100. Its totient is φ = 18539098.

The previous prime is 18539089. The next prime is 18539113. The reversal of 18539099 is 99093581.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18539099 - 2⁴ = 18539083 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18539069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9269549 + 9269550.

It is an arithmetic number, because the mean of its divisors is an integer number (9269550).

Almost surely, 2^18539099 is an apocalyptic number.

18539099 is a deficient number, since it is larger than the sum of its proper divisors (1).

18539099 is an equidigital number, since it uses as much as digits as its factorization.

18539099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 18539099 is about 4305.7054009767. The cubic root of 18539099 is about 264.6648141439.

The spelling of 18539099 in words is "eighteen million, five hundred thirty-nine thousand, ninety-nine".