9091819082809 has 2 divisors, whose sum is σ = 9091819082810. Its totient is φ = 9091819082808.

The previous prime is 9091819082807. The next prime is 9091819082813. The reversal of 9091819082809 is 9082809181909.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9090544592809 + 1274490000 = 3015053^2 + 35700^2 .

It is an emirp because it is prime and its reverse (9082809181909) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9091819082809 - 2¹ = 9091819082807 is a prime.

It is a super-2 number, since 2×9091819082809² (a number of 27 digits) contains 22 as substring.

Together with 9091819082807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9091819082807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4545909541404 + 4545909541405.

It is an arithmetic number, because the mean of its divisors is an integer number (4545909541405).

Almost surely, 2^{9091819082809} is an apocalyptic number.

It is an amenable number.

9091819082809 is a deficient number, since it is larger than the sum of its proper divisors (1).

9091819082809 is an equidigital number, since it uses as much as digits as its factorization.

9091819082809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6718464, while the sum is 64.

The spelling of 9091819082809 in words is "nine trillion, ninety-one billion, eight hundred nineteen million, eighty-two thousand, eight hundred nine".