18008017 has 2 divisors, whose sum is σ = 18008018. Its totient is φ = 18008016.

The previous prime is 18007973. The next prime is 18008021. The reversal of 18008017 is 71080081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16289296 + 1718721 = 4036^2 + 1311^2 .

It is an emirp because it is prime and its reverse (71080081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18008017 - 2⁷ = 18007889 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18007982 and 18008000.

It is not a weakly prime, because it can be changed into another prime (18008027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9004008 + 9004009.

It is an arithmetic number, because the mean of its divisors is an integer number (9004009).

Almost surely, 2^18008017 is an apocalyptic number.

It is an amenable number.

18008017 is a deficient number, since it is larger than the sum of its proper divisors (1).

18008017 is an equidigital number, since it uses as much as digits as its factorization.

18008017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 25.

The square root of 18008017 is about 4243.5853944513. The cubic root of 18008017 is about 262.1130419491.

Adding to 18008017 its reverse (71080081), we get a palindrome (89088098).

The spelling of 18008017 in words is "eighteen million, eight thousand, seventeen".