25539 has 4 divisors (see below), whose sum is σ = 34056. Its totient is φ = 17024.

The previous prime is 25537. The next prime is 25541. The reversal of 25539 is 93552.

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

It is an interprime number because it is at equal distance from previous prime (25537) and next prime (25541).

It is a cyclic number.

It is not a de Polignac number, because 25539 - 2¹ = 25537 is a prime.

It is a D-number.

It is a nialpdrome in base 14.

It is a zygodrome in base 2.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 25539.

It is not an unprimeable number, because it can be changed into a prime (25537) 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, 4254 + ... + 4259.

It is an arithmetic number, because the mean of its divisors is an integer number (8514).

2²⁵⁵³⁹ is an apocalyptic number.

25539 is a deficient number, since it is larger than the sum of its proper divisors (8517).

25539 is an equidigital number, since it uses as much as digits as its factorization.

25539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8516.

The product of its digits is 1350, while the sum is 24.

The square root of 25539 is about 159.8092613086. The cubic root of 25539 is about 29.4488244213.

The spelling of 25539 in words is "twenty-five thousand, five hundred thirty-nine".