9997911 has 60 divisors (see below), whose sum is σ = 19035720. Its totient is φ = 5171040.

The previous prime is 9997879. The next prime is 9997913. The reversal of 9997911 is 1197999.

9997911 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9997911 - 2⁵ = 9997879 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9997913) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 43545 + ... + 43773.

It is an arithmetic number, because the mean of its divisors is an integer number (317262).

Almost surely, 2^9997911 is an apocalyptic number.

9997911 is a deficient number, since it is larger than the sum of its proper divisors (9037809).

9997911 is a wasteful number, since it uses less digits than its factorization.

9997911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266 (or 250 counting only the distinct ones).

The product of its digits is 45927, while the sum is 45.

The square root of 9997911 is about 3161.9473430151. The cubic root of 9997911 is about 215.4284659115.

The spelling of 9997911 in words is "nine million, nine hundred ninety-seven thousand, nine hundred eleven".