16989569 has 2 divisors, whose sum is σ = 16989570. Its totient is φ = 16989568.

The previous prime is 16989547. The next prime is 16989593. The reversal of 16989569 is 96598961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14348944 + 2640625 = 3788^2 + 1625^2 .

It is a cyclic number.

It is not a de Polignac number, because 16989569 - 2²⁰ = 15940993 is a prime.

It is a super-2 number, since 2×16989569² = 577290909611522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16989569.

It is not a weakly prime, because it can be changed into another prime (16989529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8494784 + 8494785.

It is an arithmetic number, because the mean of its divisors is an integer number (8494785).

Almost surely, 2^16989569 is an apocalyptic number.

It is an amenable number.

16989569 is a deficient number, since it is larger than the sum of its proper divisors (1).

16989569 is an equidigital number, since it uses as much as digits as its factorization.

16989569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 53.

The square root of 16989569 is about 4121.8404869670. The cubic root of 16989569 is about 257.0755580348.

The spelling of 16989569 in words is "sixteen million, nine hundred eighty-nine thousand, five hundred sixty-nine".