26321809 has 2 divisors, whose sum is σ = 26321810. Its totient is φ = 26321808.

The previous prime is 26321803. The next prime is 26321843. The reversal of 26321809 is 90812362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14440000 + 11881809 = 3800^2 + 3447^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26321809 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26321803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13160904 + 13160905.

It is an arithmetic number, because the mean of its divisors is an integer number (13160905).

Almost surely, 2^26321809 is an apocalyptic number.

It is an amenable number.

26321809 is a deficient number, since it is larger than the sum of its proper divisors (1).

26321809 is an equidigital number, since it uses as much as digits as its factorization.

26321809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 26321809 is about 5130.4784377288. The cubic root of 26321809 is about 297.4668522256.

The spelling of 26321809 in words is "twenty-six million, three hundred twenty-one thousand, eight hundred nine".