11091091000 has 128 divisors (see below), whose sum is σ = 28633176000. Its totient is φ = 3987456000.

The previous prime is 11091090991. The next prime is 11091091013. The reversal of 11091091000 is 19019011.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 973336 + ... + 984664.

Almost surely, 2^11091091000 is an apocalyptic number.

11091091000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11091091000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14316588000).

11091091000 is an abundant number, since it is smaller than the sum of its proper divisors (17542085000).

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

11091091000 is a wasteful number, since it uses less digits than its factorization.

11091091000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11450 (or 11436 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 22.

It can be divided in two parts, 110 and 91091000, that multiplied together give a square (10020010000 = 100100²).

The spelling of 11091091000 in words is "eleven billion, ninety-one million, ninety-one thousand".