11811450809 has 2 divisors, whose sum is σ = 11811450810. Its totient is φ = 11811450808.

The previous prime is 11811450799. The next prime is 11811450841. The reversal of 11811450809 is 90805411811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7820749225 + 3990701584 = 88435^2 + 63172^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11811450809 is a prime.

It is not a weakly prime, because it can be changed into another prime (11811450899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5905725404 + 5905725405.

It is an arithmetic number, because the mean of its divisors is an integer number (5905725405).

Almost surely, 2^11811450809 is an apocalyptic number.

It is an amenable number.

11811450809 is a deficient number, since it is larger than the sum of its proper divisors (1).

11811450809 is an equidigital number, since it uses as much as digits as its factorization.

11811450809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 38.

The spelling of 11811450809 in words is "eleven billion, eight hundred eleven million, four hundred fifty thousand, eight hundred nine".