18199361 has 2 divisors, whose sum is σ = 18199362. Its totient is φ = 18199360.

The previous prime is 18199331. The next prime is 18199381. The reversal of 18199361 is 16399181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14868736 + 3330625 = 3856^2 + 1825^2 .

It is a cyclic number.

It is not a de Polignac number, because 18199361 - 2⁶ = 18199297 is a prime.

It is not a weakly prime, because it can be changed into another prime (18199331) 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, 9099680 + 9099681.

It is an arithmetic number, because the mean of its divisors is an integer number (9099681).

Almost surely, 2^18199361 is an apocalyptic number.

It is an amenable number.

18199361 is a deficient number, since it is larger than the sum of its proper divisors (1).

18199361 is an equidigital number, since it uses as much as digits as its factorization.

18199361 is an odious number, because the sum of its binary digits is odd.

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

The square root of 18199361 is about 4266.0709089278. The cubic root of 18199361 is about 263.0381329432.

The spelling of 18199361 in words is "eighteen million, one hundred ninety-nine thousand, three hundred sixty-one".