18659317 has 2 divisors, whose sum is σ = 18659318. Its totient is φ = 18659316.

The previous prime is 18659309. The next prime is 18659321. The reversal of 18659317 is 71395681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14032516 + 4626801 = 3746^2 + 2151^2 .

It is a cyclic number.

It is not a de Polignac number, because 18659317 - 2³ = 18659309 is a prime.

It is a super-2 number, since 2×18659317² = 696340221812978, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18659317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18659357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9329658 + 9329659.

It is an arithmetic number, because the mean of its divisors is an integer number (9329659).

Almost surely, 2^18659317 is an apocalyptic number.

It is an amenable number.

18659317 is a deficient number, since it is larger than the sum of its proper divisors (1).

18659317 is an equidigital number, since it uses as much as digits as its factorization.

18659317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 40.

The square root of 18659317 is about 4319.6431565582. The cubic root of 18659317 is about 265.2356607846.

The spelling of 18659317 in words is "eighteen million, six hundred fifty-nine thousand, three hundred seventeen".