25561897 has 8 divisors (see below), whose sum is σ = 28490400. Its totient is φ = 22791744.

The previous prime is 25561891. The next prime is 25561969. The reversal of 25561897 is 79816552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25561897 - 2⁷ = 25561769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25561891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39247 + ... + 39892.

It is an arithmetic number, because the mean of its divisors is an integer number (3561300).

Almost surely, 2^25561897 is an apocalyptic number.

It is an amenable number.

25561897 is a deficient number, since it is larger than the sum of its proper divisors (2928503).

25561897 is a wasteful number, since it uses less digits than its factorization.

25561897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79175.

The product of its digits is 151200, while the sum is 43.

The square root of 25561897 is about 5055.8774708254. The cubic root of 25561897 is about 294.5762257732.

The spelling of 25561897 in words is "twenty-five million, five hundred sixty-one thousand, eight hundred ninety-seven".