9979811 has 2 divisors, whose sum is σ = 9979812. Its totient is φ = 9979810.

The previous prime is 9979789. The next prime is 9979817. The reversal of 9979811 is 1189799.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9979811 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9979817) 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 as a sum of consecutive naturals, namely, 4989905 + 4989906.

It is an arithmetic number, because the mean of its divisors is an integer number (4989906).

Almost surely, 2^9979811 is an apocalyptic number.

9979811 is a deficient number, since it is larger than the sum of its proper divisors (1).

9979811 is an equidigital number, since it uses as much as digits as its factorization.

9979811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 44.

The square root of 9979811 is about 3159.0838861923. The cubic root of 9979811 is about 215.2983850495.

The spelling of 9979811 in words is "nine million, nine hundred seventy-nine thousand, eight hundred eleven".