25561325 has 12 divisors (see below), whose sum is σ = 32789940. Its totient is φ = 19743360.

The previous prime is 25561321. The next prime is 25561331. The reversal of 25561325 is 52316552.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 5004169 + 20557156 = 2237^2 + 4534^2 .

It is not a de Polignac number, because 25561325 - 2² = 25561321 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25561321) 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 11 ways as a sum of consecutive naturals, for example, 16904 + ... + 18353.

It is an arithmetic number, because the mean of its divisors is an integer number (2732495).

Almost surely, 2^25561325 is an apocalyptic number.

25561325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25561325 is a deficient number, since it is larger than the sum of its proper divisors (7228615).

25561325 is a wasteful number, since it uses less digits than its factorization.

25561325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35296 (or 35291 counting only the distinct ones).

The product of its digits is 9000, while the sum is 29.

The square root of 25561325 is about 5055.8209026824. The cubic root of 25561325 is about 294.5740285072.

Adding to 25561325 its reverse (52316552), we get a palindrome (77877877).

The spelling of 25561325 in words is "twenty-five million, five hundred sixty-one thousand, three hundred twenty-five".