9991089200 has 120 divisors (see below), whose sum is σ = 26082616320. Its totient is φ = 3663878400.

The previous prime is 9991089191. The next prime is 9991089203. The reversal of 9991089200 is 29801999.

It is not an unprimeable number, because it can be changed into a prime (9991089203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 214397 + ... + 256803.

It is an arithmetic number, because the mean of its divisors is an integer number (217355136).

Almost surely, 2^9991089200 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 9991089200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13041308160).

9991089200 is an abundant number, since it is smaller than the sum of its proper divisors (16091527120).

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

9991089200 is a wasteful number, since it uses less digits than its factorization.

9991089200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42475 (or 42464 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 47.

The square root of 9991089200 is about 99955.4360702808. The cubic root of 9991089200 is about 2153.7945753085.

The spelling of 9991089200 in words is "nine billion, nine hundred ninety-one million, eighty-nine thousand, two hundred".