25191 has 10 divisors (see below), whose sum is σ = 37752. Its totient is φ = 16740.

The previous prime is 25189. The next prime is 25219. The reversal of 25191 is 19152.

It is not a de Polignac number, because 25191 - 2¹ = 25189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25111) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 75 + ... + 236.

2²⁵¹⁹¹ is an apocalyptic number.

25191 is a deficient number, since it is larger than the sum of its proper divisors (12561).

25191 is an equidigital number, since it uses as much as digits as its factorization.

25191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323 (or 314 counting only the distinct ones).

The product of its digits is 90, while the sum is 18.

The square root of 25191 is about 158.7167287969. The cubic root of 25191 is about 29.3144535305.

Adding to 25191 its product of digits (90), we get a square (25281 = 159²).

It can be divided in two parts, 25 and 191, that added together give a cube (216 = 6³).

The spelling of 25191 in words is "twenty-five thousand, one hundred ninety-one".