18604513 has 2 divisors, whose sum is σ = 18604514. Its totient is φ = 18604512.

The previous prime is 18604499. The next prime is 18604519. The reversal of 18604513 is 31540681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12616704 + 5987809 = 3552^2 + 2447^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18604513 is a prime.

It is a super-2 number, since 2×18604513² = 692255807934338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18604519) 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, 9302256 + 9302257.

It is an arithmetic number, because the mean of its divisors is an integer number (9302257).

Almost surely, 2^18604513 is an apocalyptic number.

It is an amenable number.

18604513 is a deficient number, since it is larger than the sum of its proper divisors (1).

18604513 is an equidigital number, since it uses as much as digits as its factorization.

18604513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 18604513 is about 4313.2949122452. The cubic root of 18604513 is about 264.9757329149.

The spelling of 18604513 in words is "eighteen million, six hundred four thousand, five hundred thirteen".