18209099 has 2 divisors, whose sum is σ = 18209100. Its totient is φ = 18209098.

The previous prime is 18209063. The next prime is 18209101. The reversal of 18209099 is 99090281.

It is a strong prime.

It is an emirp because it is prime and its reverse (99090281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18209099 - 2¹⁶ = 18143563 is a prime.

Together with 18209101, 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 (18209029) 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, 9104549 + 9104550.

It is an arithmetic number, because the mean of its divisors is an integer number (9104550).

Almost surely, 2^18209099 is an apocalyptic number.

18209099 is a deficient number, since it is larger than the sum of its proper divisors (1).

18209099 is an equidigital number, since it uses as much as digits as its factorization.

18209099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 18209099 is about 4267.2120875344. The cubic root of 18209099 is about 263.0850395098.

The spelling of 18209099 in words is "eighteen million, two hundred nine thousand, ninety-nine".