26209 has 2 divisors, whose sum is σ = 26210. Its totient is φ = 26208.

The previous prime is 26203. The next prime is 26227. The reversal of 26209 is 90262.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21025 + 5184 = 145^2 + 72^2 .

It is a cyclic number.

It is not a de Polignac number, because 26209 - 2⁵ = 26177 is a prime.

It is a Chen prime.

26209 is a lucky number.

It is equal to p₂₈₈₁ and since 26209 and 2881 have the same sum of digits, it is a Honaker prime.

It is a nialpdrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26203) by changing a digit.

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 as a sum of consecutive naturals, namely, 13104 + 13105.

It is an arithmetic number, because the mean of its divisors is an integer number (13105).

2²⁶²⁰⁹ is an apocalyptic number.

It is an amenable number.

26209 is a deficient number, since it is larger than the sum of its proper divisors (1).

26209 is an equidigital number, since it uses as much as digits as its factorization.

26209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 26209 is about 161.8919392681. The cubic root of 26209 is about 29.7041286343.

The spelling of 26209 in words is "twenty-six thousand, two hundred nine".