6539 has 4 divisors (see below), whose sum is σ = 7056. Its totient is φ = 6024.

The previous prime is 6529. The next prime is 6547. The reversal of 6539 is 9356.

6539 = T₂₅ + T₂₆ + ... + T₃₇.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6539 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (6529) 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, 239 + ... + 264.

It is an arithmetic number, because the mean of its divisors is an integer number (1764).

6539 is a deficient number, since it is larger than the sum of its proper divisors (517).

6539 is a wasteful number, since it uses less digits than its factorization.

6539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516.

The product of its digits is 810, while the sum is 23.

The square root of 6539 is about 80.8640834982. The cubic root of 6539 is about 18.6998064933.

It can be divided in two parts, 6 and 539, that added together give a palindrome (545).

The spelling of 6539 in words is "six thousand, five hundred thirty-nine".