994667809 has 2 divisors, whose sum is σ = 994667810. Its totient is φ = 994667808.

The previous prime is 994667789. The next prime is 994667819. The reversal of 994667809 is 908766499.

994667809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 723341025 + 271326784 = 26895^2 + 16472^2 .

It is an emirp because it is prime and its reverse (908766499) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 994667809 - 2⁵ = 994667777 is a prime.

It is not a weakly prime, because it can be changed into another prime (994667819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497333904 + 497333905.

It is an arithmetic number, because the mean of its divisors is an integer number (497333905).

Almost surely, 2^994667809 is an apocalyptic number.

It is an amenable number.

994667809 is a deficient number, since it is larger than the sum of its proper divisors (1).

994667809 is an equidigital number, since it uses as much as digits as its factorization.

994667809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5878656, while the sum is 58.

The square root of 994667809 is about 31538.3545702689. The cubic root of 994667809 is about 998.2194344681.

The spelling of 994667809 in words is "nine hundred ninety-four million, six hundred sixty-seven thousand, eight hundred nine".