18051317 has 2 divisors, whose sum is σ = 18051318. Its totient is φ = 18051316.

The previous prime is 18051289. The next prime is 18051329. The reversal of 18051317 is 71315081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18028516 + 22801 = 4246^2 + 151^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18051317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18051347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9025658 + 9025659.

It is an arithmetic number, because the mean of its divisors is an integer number (9025659).

Almost surely, 2^18051317 is an apocalyptic number.

It is an amenable number.

18051317 is a deficient number, since it is larger than the sum of its proper divisors (1).

18051317 is an equidigital number, since it uses as much as digits as its factorization.

18051317 is an odious number, because the sum of its binary digits is odd.

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

The square root of 18051317 is about 4248.6841492396. The cubic root of 18051317 is about 262.3229560536.

Adding to 18051317 its reverse (71315081), we get a palindrome (89366398).

The spelling of 18051317 in words is "eighteen million, fifty-one thousand, three hundred seventeen".