18604931 has 2 divisors, whose sum is σ = 18604932. Its totient is φ = 18604930.

The previous prime is 18604913. The next prime is 18604967. The reversal of 18604931 is 13940681.

It is a happy number.

Together with previous prime (18604913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (13940681) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18604931 is a prime.

It is a super-2 number, since 2×18604931² = 692286915029522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18604981) 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, 9302465 + 9302466.

It is an arithmetic number, because the mean of its divisors is an integer number (9302466).

Almost surely, 2^18604931 is an apocalyptic number.

18604931 is a deficient number, since it is larger than the sum of its proper divisors (1).

18604931 is an equidigital number, since it uses as much as digits as its factorization.

18604931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 18604931 is about 4313.3433668096. The cubic root of 18604931 is about 264.9777173622.

The spelling of 18604931 in words is "eighteen million, six hundred four thousand, nine hundred thirty-one".