25897217 has 2 divisors, whose sum is σ = 25897218. Its totient is φ = 25897216.

The previous prime is 25897211. The next prime is 25897219. The reversal of 25897217 is 71279852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25816561 + 80656 = 5081^2 + 284^2 .

It is a cyclic number.

It is not a de Polignac number, because 25897217 - 2⁶ = 25897153 is a prime.

Together with 25897219, 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 (25897211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12948608 + 12948609.

It is an arithmetic number, because the mean of its divisors is an integer number (12948609).

Almost surely, 2^25897217 is an apocalyptic number.

It is an amenable number.

25897217 is a deficient number, since it is larger than the sum of its proper divisors (1).

25897217 is an equidigital number, since it uses as much as digits as its factorization.

25897217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 41.

The square root of 25897217 is about 5088.9308307345. The cubic root of 25897217 is about 295.8587140736.

The spelling of 25897217 in words is "twenty-five million, eight hundred ninety-seven thousand, two hundred seventeen".