18109099 has 2 divisors, whose sum is σ = 18109100. Its totient is φ = 18109098.

The previous prime is 18109087. The next prime is 18109103. The reversal of 18109099 is 99090181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18109099 - 2⁵ = 18109067 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18109019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9054549 + 9054550.

It is an arithmetic number, because the mean of its divisors is an integer number (9054550).

Almost surely, 2^18109099 is an apocalyptic number.

18109099 is a deficient number, since it is larger than the sum of its proper divisors (1).

18109099 is an equidigital number, since it uses as much as digits as its factorization.

18109099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 37.

The square root of 18109099 is about 4255.4787039768. The cubic root of 18109099 is about 262.6025552415.

The spelling of 18109099 in words is "eighteen million, one hundred nine thousand, ninety-nine".