18364613 has 2 divisors, whose sum is σ = 18364614. Its totient is φ = 18364612.

The previous prime is 18364609. The next prime is 18364631. The reversal of 18364613 is 31646381.

Together with next prime (18364631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15382084 + 2982529 = 3922^2 + 1727^2 .

It is a cyclic number.

It is not a de Polignac number, because 18364613 - 2² = 18364609 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18364613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18364693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9182306 + 9182307.

It is an arithmetic number, because the mean of its divisors is an integer number (9182307).

Almost surely, 2^18364613 is an apocalyptic number.

It is an amenable number.

18364613 is a deficient number, since it is larger than the sum of its proper divisors (1).

18364613 is an equidigital number, since it uses as much as digits as its factorization.

18364613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The square root of 18364613 is about 4285.3953143205. The cubic root of 18364613 is about 263.8318727879.

The spelling of 18364613 in words is "eighteen million, three hundred sixty-four thousand, six hundred thirteen".