18287317 has 2 divisors, whose sum is σ = 18287318. Its totient is φ = 18287316.

The previous prime is 18287309. The next prime is 18287327. The reversal of 18287317 is 71378281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13024881 + 5262436 = 3609^2 + 2294^2 .

It is a cyclic number.

It is not a de Polignac number, because 18287317 - 2³ = 18287309 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18287327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9143658 + 9143659.

It is an arithmetic number, because the mean of its divisors is an integer number (9143659).

Almost surely, 2^18287317 is an apocalyptic number.

It is an amenable number.

18287317 is a deficient number, since it is larger than the sum of its proper divisors (1).

18287317 is an equidigital number, since it uses as much as digits as its factorization.

18287317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18816, while the sum is 37.

The square root of 18287317 is about 4276.3672667347. The cubic root of 18287317 is about 263.4611992744.

The spelling of 18287317 in words is "eighteen million, two hundred eighty-seven thousand, three hundred seventeen".