18614641 has 2 divisors, whose sum is σ = 18614642. Its totient is φ = 18614640.

The previous prime is 18614633. The next prime is 18614731. The reversal of 18614641 is 14641681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14630625 + 3984016 = 3825^2 + 1996^2 .

It is an emirp because it is prime and its reverse (14641681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18614641 - 2³ = 18614633 is a prime.

It is not a weakly prime, because it can be changed into another prime (18614611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9307320 + 9307321.

It is an arithmetic number, because the mean of its divisors is an integer number (9307321).

Almost surely, 2^18614641 is an apocalyptic number.

It is an amenable number.

18614641 is a deficient number, since it is larger than the sum of its proper divisors (1).

18614641 is an equidigital number, since it uses as much as digits as its factorization.

18614641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 31.

The square root of 18614641 is about 4314.4687969668. The cubic root of 18614641 is about 265.0238070459.

The spelling of 18614641 in words is "eighteen million, six hundred fourteen thousand, six hundred forty-one".