26561105 has 4 divisors (see below), whose sum is σ = 31873332. Its totient is φ = 21248880.

The previous prime is 26561099. The next prime is 26561111. The reversal of 26561105 is 50116562.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (26561099) and next prime (26561111).

It can be written as a sum of positive squares in 2 ways, for example, as 18653761 + 7907344 = 4319^2 + 2812^2 .

It is not a de Polignac number, because 26561105 - 2²⁴ = 9783889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2656106 + ... + 2656115.

It is an arithmetic number, because the mean of its divisors is an integer number (7968333).

Almost surely, 2^26561105 is an apocalyptic number.

It is an amenable number.

26561105 is a deficient number, since it is larger than the sum of its proper divisors (5312227).

26561105 is an equidigital number, since it uses as much as digits as its factorization.

26561105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5312226.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 26561105 is about 5153.7466953664. The cubic root of 26561105 is about 298.3655746463.

Adding to 26561105 its reverse (50116562), we get a palindrome (76677667).

The spelling of 26561105 in words is "twenty-six million, five hundred sixty-one thousand, one hundred five".