16585409 has 4 divisors (see below), whose sum is σ = 16596420. Its totient is φ = 16574400.

The previous prime is 16585399. The next prime is 16585411. The reversal of 16585409 is 90458561.

16585409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90458561 = 641 ⋅141121.

It can be written as a sum of positive squares in 2 ways, for example, as 2334784 + 14250625 = 1528^2 + 3775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16585409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16585609) 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, 2804 + ... + 6405.

It is an arithmetic number, because the mean of its divisors is an integer number (4149105).

Almost surely, 2^16585409 is an apocalyptic number.

It is an amenable number.

16585409 is a deficient number, since it is larger than the sum of its proper divisors (11011).

16585409 is an equidigital number, since it uses as much as digits as its factorization.

16585409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11010.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 16585409 is about 4072.5187537935. The cubic root of 16585409 is about 255.0206775492.

The spelling of 16585409 in words is "sixteen million, five hundred eighty-five thousand, four hundred nine".