25479521 has 4 divisors (see below), whose sum is σ = 26072112. Its totient is φ = 24886932.

The previous prime is 25479479. The next prime is 25479523. The reversal of 25479521 is 12597452.

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 a de Polignac number, because none of the positive numbers 2^k-25479521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25479523) 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, 296231 + ... + 296316.

It is an arithmetic number, because the mean of its divisors is an integer number (6518028).

Almost surely, 2^25479521 is an apocalyptic number.

It is an amenable number.

25479521 is a deficient number, since it is larger than the sum of its proper divisors (592591).

25479521 is an equidigital number, since it uses as much as digits as its factorization.

25479521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592590.

The product of its digits is 25200, while the sum is 35.

The square root of 25479521 is about 5047.7243387491. The cubic root of 25479521 is about 294.2594505802.

The spelling of 25479521 in words is "twenty-five million, four hundred seventy-nine thousand, five hundred twenty-one".