25997317 has 4 divisors (see below), whose sum is σ = 26036620. Its totient is φ = 25958016.

The previous prime is 25997297. The next prime is 25997329. The reversal of 25997317 is 71379952.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3709476 + 22287841 = 1926^2 + 4721^2 .

It is a cyclic number.

It is not a de Polignac number, because 25997317 - 2²³ = 17608709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25997357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18642 + ... + 19987.

It is an arithmetic number, because the mean of its divisors is an integer number (6509155).

Almost surely, 2^25997317 is an apocalyptic number.

It is an amenable number.

25997317 is a deficient number, since it is larger than the sum of its proper divisors (39303).

25997317 is an equidigital number, since it uses as much as digits as its factorization.

25997317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39302.

The product of its digits is 119070, while the sum is 43.

The square root of 25997317 is about 5098.7564170099. The cubic root of 25997317 is about 296.2394162633.

The spelling of 25997317 in words is "twenty-five million, nine hundred ninety-seven thousand, three hundred seventeen".