16544609 has 4 divisors (see below), whose sum is σ = 16563204. Its totient is φ = 16526016.

The previous prime is 16544599. The next prime is 16544623. The reversal of 16544609 is 90644561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1373584 + 15171025 = 1172^2 + 3895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16544609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16544699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7892 + ... + 9765.

It is an arithmetic number, because the mean of its divisors is an integer number (4140801).

Almost surely, 2^16544609 is an apocalyptic number.

It is an amenable number.

16544609 is a deficient number, since it is larger than the sum of its proper divisors (18595).

16544609 is an equidigital number, since it uses as much as digits as its factorization.

16544609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18594.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 16544609 is about 4067.5064843218. The cubic root of 16544609 is about 254.8113894279.

The spelling of 16544609 in words is "sixteen million, five hundred forty-four thousand, six hundred nine".