16989317 has 2 divisors, whose sum is σ = 16989318. Its totient is φ = 16989316.

The previous prime is 16989283. The next prime is 16989319. The reversal of 16989317 is 71398961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11296321 + 5692996 = 3361^2 + 2386^2 .

It is an emirp because it is prime and its reverse (71398961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16989317 - 2¹⁸ = 16727173 is a prime.

Together with 16989319, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16989319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8494658 + 8494659.

It is an arithmetic number, because the mean of its divisors is an integer number (8494659).

Almost surely, 2^16989317 is an apocalyptic number.

It is an amenable number.

16989317 is a deficient number, since it is larger than the sum of its proper divisors (1).

16989317 is an equidigital number, since it uses as much as digits as its factorization.

16989317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 44.

The square root of 16989317 is about 4121.8099179851. The cubic root of 16989317 is about 257.0742869929.

The spelling of 16989317 in words is "sixteen million, nine hundred eighty-nine thousand, three hundred seventeen".