25717 has 2 divisors, whose sum is σ = 25718. Its totient is φ = 25716.

The previous prime is 25703. The next prime is 25733. The reversal of 25717 is 71752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22801 + 2916 = 151^2 + 54^2 .

It is a cyclic number.

It is not a de Polignac number, because 25717 - 2⁷ = 25589 is a prime.

It is a super-2 number, since 2×25717² = 1322728178, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12858 + 12859.

It is an arithmetic number, because the mean of its divisors is an integer number (12859).

2²⁵⁷¹⁷ is an apocalyptic number.

It is an amenable number.

25717 is a deficient number, since it is larger than the sum of its proper divisors (1).

25717 is an equidigital number, since it uses as much as digits as its factorization.

25717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 490, while the sum is 22.

The square root of 25717 is about 160.3652081968. The cubic root of 25717 is about 29.5170828951.

The spelling of 25717 in words is "twenty-five thousand, seven hundred seventeen".