25125521 has 4 divisors (see below), whose sum is σ = 25162992. Its totient is φ = 25088052.

The previous prime is 25125491. The next prime is 25125523. The reversal of 25125521 is 12552152.

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-25125521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25125523) 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, 17711 + ... + 19076.

It is an arithmetic number, because the mean of its divisors is an integer number (6290748).

Almost surely, 2^25125521 is an apocalyptic number.

It is an amenable number.

25125521 is a deficient number, since it is larger than the sum of its proper divisors (37471).

25125521 is an equidigital number, since it uses as much as digits as its factorization.

25125521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37470.

The product of its digits is 1000, while the sum is 23.

The square root of 25125521 is about 5012.5363839079. The cubic root of 25125521 is about 292.8903245936.

Adding to 25125521 its reverse (12552152), we get a palindrome (37677673).

The spelling of 25125521 in words is "twenty-five million, one hundred twenty-five thousand, five hundred twenty-one".