9111971840 has 96 divisors (see below), whose sum is σ = 21945236040. Its totient is φ = 3631153152.

The previous prime is 9111971821. The next prime is 9111971849. The reversal of 9111971840 is 481791119.

It can be written as a sum of positive squares in 4 ways, for example, as 9111847936 + 123904 = 95456^2 + 352^2 .

It is not an unprimeable number, because it can be changed into a prime (9111971849) 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 7 ways as a sum of consecutive naturals, for example, 2998802 + ... + 3001838.

Almost surely, 2^9111971840 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 9111971840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10972618020).

9111971840 is an abundant number, since it is smaller than the sum of its proper divisors (12833264200).

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

9111971840 is a wasteful number, since it uses less digits than its factorization.

9111971840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3357 (or 3337 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 41.

The square root of 9111971840 is about 95456.6490088564. The cubic root of 9111971840 is about 2088.6746204110.

The spelling of 9111971840 in words is "nine billion, one hundred eleven million, nine hundred seventy-one thousand, eight hundred forty".