18090517 has 2 divisors, whose sum is σ = 18090518. Its totient is φ = 18090516.

The previous prime is 18090491. The next prime is 18090529. The reversal of 18090517 is 71509081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18028516 + 62001 = 4246^2 + 249^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18090517 is a prime.

It is equal to p_1156675 and since 18090517 and 1156675 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18090547) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9045258 + 9045259.

It is an arithmetic number, because the mean of its divisors is an integer number (9045259).

Almost surely, 2^18090517 is an apocalyptic number.

It is an amenable number.

18090517 is a deficient number, since it is larger than the sum of its proper divisors (1).

18090517 is an equidigital number, since it uses as much as digits as its factorization.

18090517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 31.

The square root of 18090517 is about 4253.2948404737. The cubic root of 18090517 is about 262.5127044494.

Adding to 18090517 its reverse (71509081), we get a palindrome (89599598).

The spelling of 18090517 in words is "eighteen million, ninety thousand, five hundred seventeen".