26013209 has 2 divisors, whose sum is σ = 26013210. Its totient is φ = 26013208.

The previous prime is 26013167. The next prime is 26013217. The reversal of 26013209 is 90231062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21160000 + 4853209 = 4600^2 + 2203^2 .

It is a cyclic number.

It is not a de Polignac number, because 26013209 - 2⁸ = 26012953 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (26013269) 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, 13006604 + 13006605.

It is an arithmetic number, because the mean of its divisors is an integer number (13006605).

Almost surely, 2^26013209 is an apocalyptic number.

It is an amenable number.

26013209 is a deficient number, since it is larger than the sum of its proper divisors (1).

26013209 is an equidigital number, since it uses as much as digits as its factorization.

26013209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 26013209 is about 5100.3145981400. The cubic root of 26013209 is about 296.2997670787.

The spelling of 26013209 in words is "twenty-six million, thirteen thousand, two hundred nine".