16705609 has 2 divisors, whose sum is σ = 16705610. Its totient is φ = 16705608.

The previous prime is 16705607. The next prime is 16705627. The reversal of 16705609 is 90650761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13483584 + 3222025 = 3672^2 + 1795^2 .

It is an emirp because it is prime and its reverse (90650761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16705609 - 2¹ = 16705607 is a prime.

Together with 16705607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16705607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8352804 + 8352805.

It is an arithmetic number, because the mean of its divisors is an integer number (8352805).

Almost surely, 2^16705609 is an apocalyptic number.

It is an amenable number.

16705609 is a deficient number, since it is larger than the sum of its proper divisors (1).

16705609 is an equidigital number, since it uses as much as digits as its factorization.

16705609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 16705609 is about 4087.2495641935. The cubic root of 16705609 is about 255.6352685660.

The spelling of 16705609 in words is "sixteen million, seven hundred five thousand, six hundred nine".