25644251 has 2 divisors, whose sum is σ = 25644252. Its totient is φ = 25644250.

The previous prime is 25644197. The next prime is 25644253. The reversal of 25644251 is 15244652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25644251 - 2¹⁰ = 25643227 is a prime.

Together with 25644253, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25644253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12822125 + 12822126.

It is an arithmetic number, because the mean of its divisors is an integer number (12822126).

Almost surely, 2^25644251 is an apocalyptic number.

25644251 is a deficient number, since it is larger than the sum of its proper divisors (1).

25644251 is an equidigital number, since it uses as much as digits as its factorization.

25644251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9600, while the sum is 29.

The square root of 25644251 is about 5064.0153040843. The cubic root of 25644251 is about 294.8922368049.

The spelling of 25644251 in words is "twenty-five million, six hundred forty-four thousand, two hundred fifty-one".