5639 has 2 divisors, whose sum is σ = 5640.
Its totient is φ = 5638.
The previous prime is 5623. The next prime is 5641. The reversal of 5639 is 9365.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 5639 - 24 = 5623 is a prime.
It is a Sophie Germain prime.
Together with 5641, it forms a pair of twin primes.
It is a Chen prime.
It is a nialpdrome in base 9.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 5639.
It is not a weakly prime, because it can be changed into another prime (5659) by changing a digit.
It is a good prime.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2819 + 2820.
It is an arithmetic number, because the mean of its divisors is an integer number (2820).
25639 is an apocalyptic number.
5639 is a deficient number, since it is larger than the sum of its proper divisors (1).
5639 is an equidigital number, since it uses as much as digits as its factorization.
5639 is an evil number, because the sum of its binary digits is even.
The product of its digits is 810, while the sum is 23.
The square root of 5639 is about 75.0932753314.
The cubic root of 5639 is about 17.7992088189.
The spelling of 5639 in words is "five thousand, six hundred thirty-nine".