16717609 has 2 divisors, whose sum is σ = 16717610. Its totient is φ = 16717608.

The previous prime is 16717607. The next prime is 16717633. The reversal of 16717609 is 90671761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13213225 + 3504384 = 3635^2 + 1872^2 .

It is a cyclic number.

It is not a de Polignac number, because 16717609 - 2¹ = 16717607 is a prime.

Together with 16717607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16717607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8358804 + 8358805.

It is an arithmetic number, because the mean of its divisors is an integer number (8358805).

Almost surely, 2^16717609 is an apocalyptic number.

It is an amenable number.

16717609 is a deficient number, since it is larger than the sum of its proper divisors (1).

16717609 is an equidigital number, since it uses as much as digits as its factorization.

16717609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 16717609 is about 4088.7172805172. The cubic root of 16717609 is about 255.6964633620.

The spelling of 16717609 in words is "sixteen million, seven hundred seventeen thousand, six hundred nine".