25564251 has 4 divisors (see below), whose sum is σ = 34085672. Its totient is φ = 17042832.

The previous prime is 25564237. The next prime is 25564261. The reversal of 25564251 is 15246552.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 25564251 - 2⁵ = 25564219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25564261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4260706 + ... + 4260711.

It is an arithmetic number, because the mean of its divisors is an integer number (8521418).

Almost surely, 2^25564251 is an apocalyptic number.

25564251 is a deficient number, since it is larger than the sum of its proper divisors (8521421).

25564251 is an equidigital number, since it uses as much as digits as its factorization.

25564251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8521420.

The product of its digits is 12000, while the sum is 30.

The square root of 25564251 is about 5056.1102638293. The cubic root of 25564251 is about 294.5852680227.

The spelling of 25564251 in words is "twenty-five million, five hundred sixty-four thousand, two hundred fifty-one".