25911897 has 16 divisors (see below), whose sum is σ = 37824192. Its totient is φ = 15648320.

The previous prime is 25911889. The next prime is 25911911. The reversal of 25911897 is 79811952.

It is a cyclic number.

It is not a de Polignac number, because 25911897 - 2³ = 25911889 is a prime.

It is a super-2 number, since 2×25911897² = 1342852812277218, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25911817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9223 + ... + 11699.

It is an arithmetic number, because the mean of its divisors is an integer number (2364012).

Almost surely, 2^25911897 is an apocalyptic number.

It is an amenable number.

25911897 is a deficient number, since it is larger than the sum of its proper divisors (11912295).

25911897 is a wasteful number, since it uses less digits than its factorization.

25911897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2808.

The product of its digits is 45360, while the sum is 42.

The square root of 25911897 is about 5090.3729725827. The cubic root of 25911897 is about 295.9146066369.

The spelling of 25911897 in words is "twenty-five million, nine hundred eleven thousand, eight hundred ninety-seven".