5809 has 4 divisors (see below), whose sum is σ = 6004.
Its totient is φ = 5616.
The previous prime is 5807. The next prime is 5813. The reversal of 5809 is 9085.
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 3600 + 2209 = 60^2 + 47^2
It is a cyclic number.
It is not a de Polignac number, because 5809 - 21 = 5807 is a prime.
It is a Duffinian number.
5809 is a lucky number.
It is a self number, because there is not a number n which added to its sum of digits gives 5809.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (5801) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42 + ... + 115.
It is an arithmetic number, because the mean of its divisors is an integer number (1501).
25809 is an apocalyptic number.
It is an amenable number.
5809 is a deficient number, since it is larger than the sum of its proper divisors (195).
5809 is a wasteful number, since it uses less digits than its factorization.
5809 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 194.
The product of its (nonzero) digits is 360, while the sum is 22.
The square root of 5809 is about 76.2167960492.
The cubic root of 5809 is about 17.9763062738.
The spelling of 5809 in words is "five thousand, eight hundred nine".