26799809 has 2 divisors, whose sum is σ = 26799810. Its totient is φ = 26799808.

The previous prime is 26799797. The next prime is 26799811. The reversal of 26799809 is 90899762.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17405584 + 9394225 = 4172^2 + 3065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26799809 is a prime.

It is a Sophie Germain prime.

Together with 26799811, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (26799889) 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, 13399904 + 13399905.

It is an arithmetic number, because the mean of its divisors is an integer number (13399905).

Almost surely, 2^26799809 is an apocalyptic number.

It is an amenable number.

26799809 is a deficient number, since it is larger than the sum of its proper divisors (1).

26799809 is an equidigital number, since it uses as much as digits as its factorization.

26799809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 26799809 is about 5176.8531947506. The cubic root of 26799809 is about 299.2567117815.

The spelling of 26799809 in words is "twenty-six million, seven hundred ninety-nine thousand, eight hundred nine".