18616573 has 2 divisors, whose sum is σ = 18616574. Its totient is φ = 18616572.

The previous prime is 18616567. The next prime is 18616601. The reversal of 18616573 is 37561681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18344089 + 272484 = 4283^2 + 522^2 .

It is an emirp because it is prime and its reverse (37561681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18616573 - 2⁹ = 18616061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18614573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9308286 + 9308287.

It is an arithmetic number, because the mean of its divisors is an integer number (9308287).

Almost surely, 2^18616573 is an apocalyptic number.

It is an amenable number.

18616573 is a deficient number, since it is larger than the sum of its proper divisors (1).

18616573 is an equidigital number, since it uses as much as digits as its factorization.

18616573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 18616573 is about 4314.6926889409. The cubic root of 18616573 is about 265.0329756046.

The spelling of 18616573 in words is "eighteen million, six hundred sixteen thousand, five hundred seventy-three".