26855209 has 2 divisors, whose sum is σ = 26855210. Its totient is φ = 26855208.

The previous prime is 26855203. The next prime is 26855233. The reversal of 26855209 is 90255862.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26749584 + 105625 = 5172^2 + 325^2 .

It is a cyclic number.

It is not a de Polignac number, because 26855209 - 2⁹ = 26854697 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26855203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13427604 + 13427605.

It is an arithmetic number, because the mean of its divisors is an integer number (13427605).

Almost surely, 2^26855209 is an apocalyptic number.

It is an amenable number.

26855209 is a deficient number, since it is larger than the sum of its proper divisors (1).

26855209 is an equidigital number, since it uses as much as digits as its factorization.

26855209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 26855209 is about 5182.2011732468. The cubic root of 26855209 is about 299.4627755777.

The spelling of 26855209 in words is "twenty-six million, eight hundred fifty-five thousand, two hundred nine".