18204191 has 2 divisors, whose sum is σ = 18204192. Its totient is φ = 18204190.

The previous prime is 18204167. The next prime is 18204211. The reversal of 18204191 is 19140281.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18204191 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18204191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18204091) 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, 9102095 + 9102096.

It is an arithmetic number, because the mean of its divisors is an integer number (9102096).

Almost surely, 2^18204191 is an apocalyptic number.

18204191 is a deficient number, since it is larger than the sum of its proper divisors (1).

18204191 is an equidigital number, since it uses as much as digits as its factorization.

18204191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 18204191 is about 4266.6369660425. The cubic root of 18204191 is about 263.0614004599.

The spelling of 18204191 in words is "eighteen million, two hundred four thousand, one hundred ninety-one".