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25291 = 73613

25291 has 4 divisors (see below), whose sum is σ = 28912. Its totient is φ = 21672.

The previous prime is 25261. The next prime is 25301. The reversal of 25291 is 19252.

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

It is not a de Polignac number, because 25291 - 27 = 25163 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (25261) 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, 1800 + ... + 1813.

It is an arithmetic number, because the mean of its divisors is an integer number (7228).

225291 is an apocalyptic number.

25291 is a deficient number, since it is larger than the sum of its proper divisors (3621).

25291 is an equidigital number, since it uses as much as digits as its factorization.

25291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3620.

The product of its digits is 180, while the sum is 19.

The square root of 25291 is about 159.0314434318. The cubic root of 25291 is about 29.3531919017.

It can be divided in two parts, 252 and 91, that added together give a palindrome (343).

The spelling of 25291 in words is "twenty-five thousand, two hundred ninety-one".

Divisors: 1 7 3613 25291