26561789 has 2 divisors, whose sum is σ = 26561790. Its totient is φ = 26561788.

The previous prime is 26561771. The next prime is 26561827. The reversal of 26561789 is 98716562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17056900 + 9504889 = 4130^2 + 3083^2 .

It is a cyclic number.

It is not a de Polignac number, because 26561789 - 2²⁴ = 9784573 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26561719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13280894 + 13280895.

It is an arithmetic number, because the mean of its divisors is an integer number (13280895).

Almost surely, 2^26561789 is an apocalyptic number.

It is an amenable number.

26561789 is a deficient number, since it is larger than the sum of its proper divisors (1).

26561789 is an equidigital number, since it uses as much as digits as its factorization.

26561789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 44.

The square root of 26561789 is about 5153.8130544287. The cubic root of 26561789 is about 298.3681357885.

The spelling of 26561789 in words is "twenty-six million, five hundred sixty-one thousand, seven hundred eighty-nine".