9996809 has 2 divisors, whose sum is σ = 9996810. Its totient is φ = 9996808.

The previous prime is 9996803. The next prime is 9996817. The reversal of 9996809 is 9086999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7038409 + 2958400 = 2653^2 + 1720^2 .

It is a cyclic number.

It is not a de Polignac number, because 9996809 - 2¹² = 9992713 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (9996803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4998404 + 4998405.

It is an arithmetic number, because the mean of its divisors is an integer number (4998405).

Almost surely, 2^9996809 is an apocalyptic number.

It is an amenable number.

9996809 is a deficient number, since it is larger than the sum of its proper divisors (1).

9996809 is an equidigital number, since it uses as much as digits as its factorization.

9996809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 314928, while the sum is 50.

The square root of 9996809 is about 3161.7730785115. The cubic root of 9996809 is about 215.4205505616.

The spelling of 9996809 in words is "nine million, nine hundred ninety-six thousand, eight hundred nine".