9997811 has 4 divisors (see below), whose sum is σ = 10005072. Its totient is φ = 9990552.

The previous prime is 9997787. The next prime is 9997817. The reversal of 9997811 is 1187999.

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 9997811 - 2⁶ = 9997747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9997817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 860 + ... + 4553.

It is an arithmetic number, because the mean of its divisors is an integer number (2501268).

Almost surely, 2^9997811 is an apocalyptic number.

9997811 is a deficient number, since it is larger than the sum of its proper divisors (7261).

9997811 is a wasteful number, since it uses less digits than its factorization.

9997811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7260.

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

The square root of 9997811 is about 3161.9315299355. The cubic root of 9997811 is about 215.4277476642.

The spelling of 9997811 in words is "nine million, nine hundred ninety-seven thousand, eight hundred eleven".