18620617 has 2 divisors, whose sum is σ = 18620618. Its totient is φ = 18620616.

The previous prime is 18620603. The next prime is 18620647. The reversal of 18620617 is 71602681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18412681 + 207936 = 4291^2 + 456^2 .

It is an emirp because it is prime and its reverse (71602681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18620617 - 2⁷ = 18620489 is a prime.

It is not a weakly prime, because it can be changed into another prime (18620647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9310308 + 9310309.

It is an arithmetic number, because the mean of its divisors is an integer number (9310309).

Almost surely, 2^18620617 is an apocalyptic number.

It is an amenable number.

18620617 is a deficient number, since it is larger than the sum of its proper divisors (1).

18620617 is an equidigital number, since it uses as much as digits as its factorization.

18620617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 18620617 is about 4315.1612947838. The cubic root of 18620617 is about 265.0521648820.

The spelling of 18620617 in words is "eighteen million, six hundred twenty thousand, six hundred seventeen".