25564217 has 4 divisors (see below), whose sum is σ = 29216256. Its totient is φ = 21912180.

The previous prime is 25564213. The next prime is 25564219. The reversal of 25564217 is 71246552.

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 25564217 - 2² = 25564213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25564213) 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, 1826009 + ... + 1826022.

It is an arithmetic number, because the mean of its divisors is an integer number (7304064).

Almost surely, 2^25564217 is an apocalyptic number.

It is an amenable number.

25564217 is a deficient number, since it is larger than the sum of its proper divisors (3652039).

25564217 is an equidigital number, since it uses as much as digits as its factorization.

25564217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3652038.

The product of its digits is 16800, while the sum is 32.

The square root of 25564217 is about 5056.1069015597. The cubic root of 25564217 is about 294.5851374249.

The spelling of 25564217 in words is "twenty-five million, five hundred sixty-four thousand, two hundred seventeen".