25561441 has 16 divisors (see below), whose sum is σ = 29059200. Its totient is φ = 22353408.

The previous prime is 25561439. The next prime is 25561447. The reversal of 25561441 is 14416552.

It is a cyclic number.

It is not a de Polignac number, because 25561441 - 2¹ = 25561439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25561447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11665 + ... + 13681.

It is an arithmetic number, because the mean of its divisors is an integer number (1816200).

Almost surely, 2^25561441 is an apocalyptic number.

It is an amenable number.

25561441 is a deficient number, since it is larger than the sum of its proper divisors (3497759).

25561441 is a wasteful number, since it uses less digits than its factorization.

25561441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2088.

The product of its digits is 4800, while the sum is 28.

The square root of 25561441 is about 5055.8323745947. The cubic root of 25561441 is about 294.5744741093.

Adding to 25561441 its reverse (14416552), we get a palindrome (39977993).

The spelling of 25561441 in words is "twenty-five million, five hundred sixty-one thousand, four hundred forty-one".