25361 has 4 divisors (see below), whose sum is σ = 28992. Its totient is φ = 21732.

The previous prime is 25357. The next prime is 25367. The reversal of 25361 is 16352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25361 - 2² = 25357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (25367) 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, 1805 + ... + 1818.

It is an arithmetic number, because the mean of its divisors is an integer number (7248).

2²⁵³⁶¹ is an apocalyptic number.

It is an amenable number.

25361 is a deficient number, since it is larger than the sum of its proper divisors (3631).

25361 is an equidigital number, since it uses as much as digits as its factorization.

25361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3630.

The product of its digits is 180, while the sum is 17.

The square root of 25361 is about 159.2513736204. The cubic root of 25361 is about 29.3802480438.

Subtracting from 25361 its reverse (16352), we obtain a palindrome (9009).

It can be divided in two parts, 25 and 361, that multiplied together give a square (9025 = 95²).

The spelling of 25361 in words is "twenty-five thousand, three hundred sixty-one".