9991168 has 44 divisors (see below), whose sum is σ = 21812832. Its totient is φ = 4536320.

The previous prime is 9991159. The next prime is 9991183. The reversal of 9991168 is 8611999.

9991168 is nontrivially palindromic in base 15.

It is a tau number, because it is divible by the number of its divisors (44).

It is a nialpdrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10821 + ... + 11707.

Almost surely, 2^9991168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9991168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10906416).

9991168 is an abundant number, since it is smaller than the sum of its proper divisors (11821664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9991168 is a wasteful number, since it uses less digits than its factorization.

9991168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918 (or 900 counting only the distinct ones).

The product of its digits is 34992, while the sum is 43.

The square root of 9991168 is about 3160.8808898786. The cubic root of 9991168 is about 215.3800237640.

The spelling of 9991168 in words is "nine million, nine hundred ninety-one thousand, one hundred sixty-eight".