25105 has 4 divisors (see below), whose sum is σ = 30132. Its totient is φ = 20080.

The previous prime is 25097. The next prime is 25111. The reversal of 25105 is 50152.

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 16641 + 8464 = 129^2 + 92^2 .

It is not a de Polignac number, because 25105 - 2³ = 25097 is a prime.

It is a super-2 number, since 2×25105² = 1260522050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2506 + ... + 2515.

It is an arithmetic number, because the mean of its divisors is an integer number (7533).

25105 is a Friedman number, since it can be written as 5021*5, using all its digits and the basic arithmetic operations.

2²⁵¹⁰⁵ is an apocalyptic number.

It is an amenable number.

25105 is a deficient number, since it is larger than the sum of its proper divisors (5027).

25105 is an equidigital number, since it uses as much as digits as its factorization.

25105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5026.

The product of its (nonzero) digits is 50, while the sum is 13.

The square root of 25105 is about 158.4455742519. The cubic root of 25105 is about 29.2810564531.

Adding to 25105 its reverse (50152), we get a palindrome (75257).

The spelling of 25105 in words is "twenty-five thousand, one hundred five".