999806911 has 2 divisors, whose sum is σ = 999806912. Its totient is φ = 999806910.

The previous prime is 999806887. The next prime is 999806921. The reversal of 999806911 is 119608999.

It is a strong prime.

It is an emirp because it is prime and its reverse (119608999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999806911 - 2⁷ = 999806783 is a prime.

It is a super-2 number, since 2×999806911² = 1999227718566723842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999806921) 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, 499903455 + 499903456.

It is an arithmetic number, because the mean of its divisors is an integer number (499903456).

Almost surely, 2^999806911 is an apocalyptic number.

999806911 is a deficient number, since it is larger than the sum of its proper divisors (1).

999806911 is an equidigital number, since it uses as much as digits as its factorization.

999806911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 314928, while the sum is 52.

The square root of 999806911 is about 31619.7234491385. The cubic root of 999806911 is about 999.9356328570.

The spelling of 999806911 in words is "nine hundred ninety-nine million, eight hundred six thousand, nine hundred eleven".