25561105 has 8 divisors (see below), whose sum is σ = 31252392. Its totient is φ = 20062848.

The previous prime is 25561079. The next prime is 25561139. The reversal of 25561105 is 50116552.

It can be written as a sum of positive squares in 4 ways, for example, as 7096896 + 18464209 = 2664^2 + 4297^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 25561105 - 2¹¹ = 25559057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25561105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47964 + ... + 48493.

It is an arithmetic number, because the mean of its divisors is an integer number (3906549).

Almost surely, 2^25561105 is an apocalyptic number.

It is an amenable number.

25561105 is a deficient number, since it is larger than the sum of its proper divisors (5691287).

25561105 is an equidigital number, since it uses as much as digits as its factorization.

25561105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96515.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 25561105 is about 5055.7991455357. The cubic root of 25561105 is about 294.5731833962.

Adding to 25561105 its reverse (50116552), we get a palindrome (75677657).

The spelling of 25561105 in words is "twenty-five million, five hundred sixty-one thousand, one hundred five".