5609 has 4 divisors (see below), whose sum is σ = 5760. Its totient is φ = 5460.

The previous prime is 5591. The next prime is 5623. The reversal of 5609 is 9065.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5609 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (5639) 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, 32 + ... + 110.

It is an arithmetic number, because the mean of its divisors is an integer number (1440).

2⁵⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

5609 is a deficient number, since it is larger than the sum of its proper divisors (151).

5609 is an equidigital number, since it uses as much as digits as its factorization.

5609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 5609 is about 74.8932573734. The cubic root of 5609 is about 17.7675882002.

The spelling of 5609 in words is "five thousand, six hundred nine".