9812809 has 2 divisors, whose sum is σ = 9812810. Its totient is φ = 9812808.

The previous prime is 9812783. The next prime is 9812837. The reversal of 9812809 is 9082189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7139584 + 2673225 = 2672^2 + 1635^2 .

It is an emirp because it is prime and its reverse (9082189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9812809 - 2²¹ = 7715657 is a prime.

It is not a weakly prime, because it can be changed into another prime (9812609) 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, 4906404 + 4906405.

It is an arithmetic number, because the mean of its divisors is an integer number (4906405).

Almost surely, 2^9812809 is an apocalyptic number.

It is an amenable number.

9812809 is a deficient number, since it is larger than the sum of its proper divisors (1).

9812809 is an equidigital number, since it uses as much as digits as its factorization.

9812809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 9812809 is about 3132.5403429166. The cubic root of 9812809 is about 214.0906900094.

The spelling of 9812809 in words is "nine million, eight hundred twelve thousand, eight hundred nine".