25697 has 4 divisors (see below), whose sum is σ = 29376. Its totient is φ = 22020.

The previous prime is 25693. The next prime is 25703. The reversal of 25697 is 79652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25697 - 2² = 25693 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 25697.

It is not an unprimeable number, because it can be changed into a prime (25693) 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, 1829 + ... + 1842.

It is an arithmetic number, because the mean of its divisors is an integer number (7344).

2²⁵⁶⁹⁷ is an apocalyptic number.

It is an amenable number.

25697 is a deficient number, since it is larger than the sum of its proper divisors (3679).

25697 is an equidigital number, since it uses as much as digits as its factorization.

25697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3678.

The product of its digits is 3780, while the sum is 29.

The square root of 25697 is about 160.3028384028. The cubic root of 25697 is about 29.5094291413.

It can be divided in two parts, 256 and 97, that added together give a palindrome (353).

The spelling of 25697 in words is "twenty-five thousand, six hundred ninety-seven".