18108217 has 2 divisors, whose sum is σ = 18108218. Its totient is φ = 18108216.

The previous prime is 18108173. The next prime is 18108227. The reversal of 18108217 is 71280181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11431161 + 6677056 = 3381^2 + 2584^2 .

It is a cyclic number.

It is not a de Polignac number, because 18108217 - 2⁷ = 18108089 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18108227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9054108 + 9054109.

It is an arithmetic number, because the mean of its divisors is an integer number (9054109).

Almost surely, 2^18108217 is an apocalyptic number.

It is an amenable number.

18108217 is a deficient number, since it is larger than the sum of its proper divisors (1).

18108217 is an equidigital number, since it uses as much as digits as its factorization.

18108217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 28.

The square root of 18108217 is about 4255.3750716006. The cubic root of 18108217 is about 262.5982918375.

Adding to 18108217 its reverse (71280181), we get a palindrome (89388398).

The spelling of 18108217 in words is "eighteen million, one hundred eight thousand, two hundred seventeen".