999816799 has 2 divisors, whose sum is σ = 999816800. Its totient is φ = 999816798.

The previous prime is 999816791. The next prime is 999816871. The reversal of 999816799 is 997618999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999816799 - 2³ = 999816791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999816791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499908399 + 499908400.

It is an arithmetic number, because the mean of its divisors is an integer number (499908400).

Almost surely, 2^999816799 is an apocalyptic number.

999816799 is a deficient number, since it is larger than the sum of its proper divisors (1).

999816799 is an equidigital number, since it uses as much as digits as its factorization.

999816799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19840464, while the sum is 67.

The square root of 999816799 is about 31619.8798068557. The cubic root of 999816799 is about 999.9389292704.

The spelling of 999816799 in words is "nine hundred ninety-nine million, eight hundred sixteen thousand, seven hundred ninety-nine".