25697317 has 2 divisors, whose sum is σ = 25697318. Its totient is φ = 25697316.

The previous prime is 25697299. The next prime is 25697323. The reversal of 25697317 is 71379652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20061441 + 5635876 = 4479^2 + 2374^2 .

It is a cyclic number.

It is not a de Polignac number, because 25697317 - 2¹¹ = 25695269 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25697317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25697377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12848658 + 12848659.

It is an arithmetic number, because the mean of its divisors is an integer number (12848659).

Almost surely, 2^25697317 is an apocalyptic number.

It is an amenable number.

25697317 is a deficient number, since it is larger than the sum of its proper divisors (1).

25697317 is an equidigital number, since it uses as much as digits as its factorization.

25697317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 79380, while the sum is 40.

The square root of 25697317 is about 5069.2521144642. The cubic root of 25697317 is about 295.0955048430.

The spelling of 25697317 in words is "twenty-five million, six hundred ninety-seven thousand, three hundred seventeen".