18305117 has 2 divisors, whose sum is σ = 18305118. Its totient is φ = 18305116.

The previous prime is 18305071. The next prime is 18305129. The reversal of 18305117 is 71150381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18156121 + 148996 = 4261^2 + 386^2 .

It is a cyclic number.

It is not a de Polignac number, because 18305117 - 2⁸ = 18304861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18305197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9152558 + 9152559.

It is an arithmetic number, because the mean of its divisors is an integer number (9152559).

Almost surely, 2^18305117 is an apocalyptic number.

It is an amenable number.

18305117 is a deficient number, since it is larger than the sum of its proper divisors (1).

18305117 is an equidigital number, since it uses as much as digits as its factorization.

18305117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 26.

The square root of 18305117 is about 4278.4479662607. The cubic root of 18305117 is about 263.5466517335.

Adding to 18305117 its reverse (71150381), we get a palindrome (89455498).

The spelling of 18305117 in words is "eighteen million, three hundred five thousand, one hundred seventeen".