18366913 has 2 divisors, whose sum is σ = 18366914. Its totient is φ = 18366912.

The previous prime is 18366899. The next prime is 18366923. The reversal of 18366913 is 31966381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14653584 + 3713329 = 3828^2 + 1927^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18366913 is a prime.

It is not a weakly prime, because it can be changed into another prime (18366923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9183456 + 9183457.

It is an arithmetic number, because the mean of its divisors is an integer number (9183457).

Almost surely, 2^18366913 is an apocalyptic number.

It is an amenable number.

18366913 is a deficient number, since it is larger than the sum of its proper divisors (1).

18366913 is an equidigital number, since it uses as much as digits as its factorization.

18366913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 37.

The square root of 18366913 is about 4285.6636592248. The cubic root of 18366913 is about 263.8428865054.

The spelling of 18366913 in words is "eighteen million, three hundred sixty-six thousand, nine hundred thirteen".