11835809 has 2 divisors, whose sum is σ = 11835810. Its totient is φ = 11835808.

The previous prime is 11835787. The next prime is 11835827. The reversal of 11835809 is 90853811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11833600 + 2209 = 3440^2 + 47^2 .

It is an emirp because it is prime and its reverse (90853811) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11835809 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 (11837809) 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, 5917904 + 5917905.

It is an arithmetic number, because the mean of its divisors is an integer number (5917905).

Almost surely, 2^11835809 is an apocalyptic number.

It is an amenable number.

11835809 is a deficient number, since it is larger than the sum of its proper divisors (1).

11835809 is an equidigital number, since it uses as much as digits as its factorization.

11835809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 11835809 is about 3440.3210605989. The cubic root of 11835809 is about 227.8938730979.

The spelling of 11835809 in words is "eleven million, eight hundred thirty-five thousand, eight hundred nine".