25326521 has 4 divisors (see below), whose sum is σ = 27628944. Its totient is φ = 23024100.

The previous prime is 25326503. The next prime is 25326523. The reversal of 25326521 is 12562352.

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 not a de Polignac number, because 25326521 - 2¹⁴ = 25310137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25326523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1151195 + ... + 1151216.

It is an arithmetic number, because the mean of its divisors is an integer number (6907236).

Almost surely, 2^25326521 is an apocalyptic number.

It is an amenable number.

25326521 is a deficient number, since it is larger than the sum of its proper divisors (2302423).

25326521 is a wasteful number, since it uses less digits than its factorization.

25326521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2302422.

The product of its digits is 3600, while the sum is 26.

The square root of 25326521 is about 5032.5461746516. The cubic root of 25326521 is about 293.6692757814.

Adding to 25326521 its reverse (12562352), we get a palindrome (37888873).

The spelling of 25326521 in words is "twenty-five million, three hundred twenty-six thousand, five hundred twenty-one".