16985317 has 2 divisors, whose sum is σ = 16985318. Its totient is φ = 16985316.

The previous prime is 16985263. The next prime is 16985321. The reversal of 16985317 is 71358961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14753281 + 2232036 = 3841^2 + 1494^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16985317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16985317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16985327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8492658 + 8492659.

It is an arithmetic number, because the mean of its divisors is an integer number (8492659).

Almost surely, 2^16985317 is an apocalyptic number.

It is an amenable number.

16985317 is a deficient number, since it is larger than the sum of its proper divisors (1).

16985317 is an equidigital number, since it uses as much as digits as its factorization.

16985317 is an odious number, because the sum of its binary digits is odd.

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

The square root of 16985317 is about 4121.3246656870. The cubic root of 16985317 is about 257.0541100417.

The spelling of 16985317 in words is "sixteen million, nine hundred eighty-five thousand, three hundred seventeen".