25544561 has 8 divisors (see below), whose sum is σ = 29240640. Its totient is φ = 21860208.

The previous prime is 25544539. The next prime is 25544573. The reversal of 25544561 is 16544552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25544561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25544501) 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 7 ways as a sum of consecutive naturals, for example, 2390 + ... + 7536.

It is an arithmetic number, because the mean of its divisors is an integer number (3655080).

Almost surely, 2^25544561 is an apocalyptic number.

It is an amenable number.

25544561 is a deficient number, since it is larger than the sum of its proper divisors (3696079).

25544561 is an equidigital number, since it uses as much as digits as its factorization.

25544561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5863.

The product of its digits is 24000, while the sum is 32.

The square root of 25544561 is about 5054.1627397621. The cubic root of 25544561 is about 294.5096171493.

Subtracting from 25544561 its reverse (16544552), we obtain a palindrome (9000009).

The spelling of 25544561 in words is "twenty-five million, five hundred forty-four thousand, five hundred sixty-one".