25435521 has 12 divisors (see below), whose sum is σ = 36805860. Its totient is φ = 16926720.

The previous prime is 25435517. The next prime is 25435561. The reversal of 25435521 is 12553452.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12215025 + 13220496 = 3495^2 + 3636^2 .

It is not a de Polignac number, because 25435521 - 2² = 25435517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25435561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3565 + ... + 7973.

It is an arithmetic number, because the mean of its divisors is an integer number (3067155).

Almost surely, 2^25435521 is an apocalyptic number.

It is an amenable number.

25435521 is a deficient number, since it is larger than the sum of its proper divisors (11370339).

25435521 is a wasteful number, since it uses less digits than its factorization.

25435521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5056 (or 5053 counting only the distinct ones).

The product of its digits is 6000, while the sum is 27.

The square root of 25435521 is about 5043.3640558659. The cubic root of 25435521 is about 294.0899696881.

Adding to 25435521 its reverse (12553452), we get a palindrome (37988973).

The spelling of 25435521 in words is "twenty-five million, four hundred thirty-five thousand, five hundred twenty-one".