9999811 has 4 divisors (see below), whose sum is σ = 10007712. Its totient is φ = 9991912.

The previous prime is 9999761. The next prime is 9999823. The reversal of 9999811 is 1189999.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 9999811 - 2⁹ = 9999299 is a prime.

It is a Duffinian number.

9999811 is a lucky number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (9999511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1576 + ... + 4741.

It is an arithmetic number, because the mean of its divisors is an integer number (2501928).

Almost surely, 2^9999811 is an apocalyptic number.

9999811 is a deficient number, since it is larger than the sum of its proper divisors (7901).

9999811 is a wasteful number, since it uses less digits than its factorization.

9999811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7900.

The product of its digits is 52488, while the sum is 46.

The square root of 9999811 is about 3162.2477765033. The cubic root of 9999811 is about 215.4421117008.

The spelling of 9999811 in words is "nine million, nine hundred ninety-nine thousand, eight hundred eleven".