25575221 has 4 divisors (see below), whose sum is σ = 29228832. Its totient is φ = 21921612.

The previous prime is 25575181. The next prime is 25575227. The reversal of 25575221 is 12257552.

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 25575221 - 2¹⁸ = 25313077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25575227) 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, 1826795 + ... + 1826808.

It is an arithmetic number, because the mean of its divisors is an integer number (7307208).

Almost surely, 2^25575221 is an apocalyptic number.

It is an amenable number.

25575221 is a deficient number, since it is larger than the sum of its proper divisors (3653611).

25575221 is an equidigital number, since it uses as much as digits as its factorization.

25575221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3653610.

The product of its digits is 7000, while the sum is 29.

The square root of 25575221 is about 5057.1949735006. The cubic root of 25575221 is about 294.6273989690.

The spelling of 25575221 in words is "twenty-five million, five hundred seventy-five thousand, two hundred twenty-one".