16590989 has 2 divisors, whose sum is σ = 16590990. Its totient is φ = 16590988.

The previous prime is 16590979. The next prime is 16591033. The reversal of 16590989 is 98909561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11222500 + 5368489 = 3350^2 + 2317^2 .

It is a cyclic number.

It is not a de Polignac number, because 16590989 - 2²⁰ = 15542413 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16590919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8295494 + 8295495.

It is an arithmetic number, because the mean of its divisors is an integer number (8295495).

Almost surely, 2^16590989 is an apocalyptic number.

It is an amenable number.

16590989 is a deficient number, since it is larger than the sum of its proper divisors (1).

16590989 is an equidigital number, since it uses as much as digits as its factorization.

16590989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 174960, while the sum is 47.

The square root of 16590989 is about 4073.2037758993. The cubic root of 16590989 is about 255.0492740869.

The spelling of 16590989 in words is "sixteen million, five hundred ninety thousand, nine hundred eighty-nine".