25871 has 4 divisors (see below), whose sum is σ = 26544. Its totient is φ = 25200.

The previous prime is 25867. The next prime is 25873. The reversal of 25871 is 17852.

25871 = T₁₃ + T₁₄ + ... + T₅₃.

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

It is a cyclic number.

It is not a de Polignac number, because 25871 - 2² = 25867 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

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 25871.

It is not an unprimeable number, because it can be changed into a prime (25873) 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, 275 + ... + 356.

It is an arithmetic number, because the mean of its divisors is an integer number (6636).

2²⁵⁸⁷¹ is an apocalyptic number.

25871 is a deficient number, since it is larger than the sum of its proper divisors (673).

25871 is an equidigital number, since it uses as much as digits as its factorization.

25871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672.

The product of its digits is 560, while the sum is 23.

The square root of 25871 is about 160.8446455435. The cubic root of 25871 is about 29.5758843023.

The spelling of 25871 in words is "twenty-five thousand, eight hundred seventy-one".