18616601 has 2 divisors, whose sum is σ = 18616602. Its totient is φ = 18616600.

The previous prime is 18616573. The next prime is 18616607. The reversal of 18616601 is 10661681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17808400 + 808201 = 4220^2 + 899^2 .

It is a cyclic number.

It is not a de Polignac number, because 18616601 - 2¹⁰ = 18615577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18616607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9308300 + 9308301.

It is an arithmetic number, because the mean of its divisors is an integer number (9308301).

Almost surely, 2^18616601 is an apocalyptic number.

It is an amenable number.

18616601 is a deficient number, since it is larger than the sum of its proper divisors (1).

18616601 is an equidigital number, since it uses as much as digits as its factorization.

18616601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 18616601 is about 4314.6959336667. The cubic root of 18616601 is about 265.0331084775.

The spelling of 18616601 in words is "eighteen million, six hundred sixteen thousand, six hundred one".