18055199 has 2 divisors, whose sum is σ = 18055200. Its totient is φ = 18055198.

The previous prime is 18055171. The next prime is 18055201. The reversal of 18055199 is 99155081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18055199 - 2⁸ = 18054943 is a prime.

Together with 18055201, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18055159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9027599 + 9027600.

It is an arithmetic number, because the mean of its divisors is an integer number (9027600).

Almost surely, 2^18055199 is an apocalyptic number.

18055199 is a deficient number, since it is larger than the sum of its proper divisors (1).

18055199 is an equidigital number, since it uses as much as digits as its factorization.

18055199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 38.

The square root of 18055199 is about 4249.1409720083. The cubic root of 18055199 is about 262.3417592011.

The spelling of 18055199 in words is "eighteen million, fifty-five thousand, one hundred ninety-nine".