9091000000 has 98 divisors (see below), whose sum is σ = 22552133204. Its totient is φ = 3636000000.

The previous prime is 9090999961. The next prime is 9091000013. The reversal of 9091000000 is 1909.

9091000000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 995455 + ... + 1004545.

Almost surely, 2^9091000000 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 9091000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11276066602).

9091000000 is an abundant number, since it is smaller than the sum of its proper divisors (13461133204).

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

9091000000 is an frugal number, since it uses more digits than its factorization.

9091000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9133 (or 9098 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 19.

The square root of 9091000000 is about 95346.7356546620. The cubic root of 9091000000 is about 2087.0709792801.

Adding to 9091000000 its reverse (1909), we get a palindrome (9091001909).

The spelling of 9091000000 in words is "nine billion, ninety-one million", and thus it is an aban number and an uban number.