25051521 has 16 divisors (see below), whose sum is σ = 36552960. Its totient is φ = 15135120.

The previous prime is 25051487. The next prime is 25051529. The reversal of 25051521 is 12515052.

It is not a de Polignac number, because 25051521 - 2²² = 20857217 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25051529) 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 15 ways as a sum of consecutive naturals, for example, 11506 + ... + 13508.

It is an arithmetic number, because the mean of its divisors is an integer number (2284560).

Almost surely, 2^25051521 is an apocalyptic number.

It is an amenable number.

25051521 is a deficient number, since it is larger than the sum of its proper divisors (11501439).

25051521 is a wasteful number, since it uses less digits than its factorization.

25051521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2396.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 25051521 is about 5005.1494483182. The cubic root of 25051521 is about 292.6025004198.

Adding to 25051521 its reverse (12515052), we get a palindrome (37566573).

The spelling of 25051521 in words is "twenty-five million, fifty-one thousand, five hundred twenty-one".