26108561 has 4 divisors (see below), whose sum is σ = 26134500. Its totient is φ = 26082624.

The previous prime is 26108531. The next prime is 26108567. The reversal of 26108561 is 16580162.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16580162 = 2 ⋅8290081.

It can be written as a sum of positive squares in 2 ways, for example, as 9859600 + 16248961 = 3140^2 + 4031^2 .

It is a cyclic number.

It is not a de Polignac number, because 26108561 - 2¹⁰ = 26107537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26108567) 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 3 ways as a sum of consecutive naturals, for example, 11396 + ... + 13493.

It is an arithmetic number, because the mean of its divisors is an integer number (6533625).

Almost surely, 2^26108561 is an apocalyptic number.

It is an amenable number.

26108561 is a deficient number, since it is larger than the sum of its proper divisors (25939).

26108561 is a wasteful number, since it uses less digits than its factorization.

26108561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25938.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 26108561 is about 5109.6537064658. The cubic root of 26108561 is about 296.6613567763.

The spelling of 26108561 in words is "twenty-six million, one hundred eight thousand, five hundred sixty-one".