25391 has 2 divisors, whose sum is σ = 25392. Its totient is φ = 25390.

The previous prime is 25373. The next prime is 25409. The reversal of 25391 is 19352.

25391 is nontrivially palindromic in base 5.

It is a balanced prime because it is at equal distance from previous prime (25373) and next prime (25409).

It is a cyclic number.

It is not a de Polignac number, because 25391 - 2¹⁴ = 9007 is a prime.

It is a Chen prime.

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 25391.

It is not a weakly prime, because it can be changed into another prime (25301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12695 + 12696.

It is an arithmetic number, because the mean of its divisors is an integer number (12696).

2²⁵³⁹¹ is an apocalyptic number.

25391 is a deficient number, since it is larger than the sum of its proper divisors (1).

25391 is an equidigital number, since it uses as much as digits as its factorization.

25391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270, while the sum is 20.

The square root of 25391 is about 159.3455364922. The cubic root of 25391 is about 29.3918282933.

The spelling of 25391 in words is "twenty-five thousand, three hundred ninety-one".