18109499 has 2 divisors, whose sum is σ = 18109500. Its totient is φ = 18109498.

The previous prime is 18109457. The next prime is 18109501. The reversal of 18109499 is 99490181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18109499 - 2¹² = 18105403 is a prime.

Together with 18109501, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18109099) 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, 9054749 + 9054750.

It is an arithmetic number, because the mean of its divisors is an integer number (9054750).

Almost surely, 2^18109499 is an apocalyptic number.

18109499 is a deficient number, since it is larger than the sum of its proper divisors (1).

18109499 is an equidigital number, since it uses as much as digits as its factorization.

18109499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 18109499 is about 4255.5257019550. The cubic root of 18109499 is about 262.6044887124.

The spelling of 18109499 in words is "eighteen million, one hundred nine thousand, four hundred ninety-nine".