25756217 has 2 divisors, whose sum is σ = 25756218. Its totient is φ = 25756216.

The previous prime is 25756193. The next prime is 25756219. The reversal of 25756217 is 71265752.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24245776 + 1510441 = 4924^2 + 1229^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25756217 is a prime.

Together with 25756219, 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 (25756219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12878108 + 12878109.

It is an arithmetic number, because the mean of its divisors is an integer number (12878109).

Almost surely, 2^25756217 is an apocalyptic number.

It is an amenable number.

25756217 is a deficient number, since it is larger than the sum of its proper divisors (1).

25756217 is an equidigital number, since it uses as much as digits as its factorization.

25756217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29400, while the sum is 35.

The square root of 25756217 is about 5075.0583247880. The cubic root of 25756217 is about 295.3207924680.

The spelling of 25756217 in words is "twenty-five million, seven hundred fifty-six thousand, two hundred seventeen".