1091099132928 has 528 divisors, whose sum is σ = 3886858010880. Its totient is φ = 287894863872.

The previous prime is 1091099132927. The next prime is 1091099132989. The reversal of 1091099132928 is 8292319901901.

1091099132928 is a `hidden beast` number, since 109 + 109 + 91 + 329 + 28 = 666.

It is not an unprimeable number, because it can be changed into a prime (1091099132927) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 43016826 + ... + 43042182.

Almost surely, 2^{1091099132928} is an apocalyptic number.

1091099132928 is a gapful number since it is divisible by the number (18) 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 1091099132928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1943429005440).

1091099132928 is an abundant number, since it is smaller than the sum of its proper divisors (2795758877952).

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

1091099132928 is a wasteful number, since it uses less digits than its factorization.

1091099132928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25442 (or 25421 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 54.

The spelling of 1091099132928 in words is "one trillion, ninety-one billion, ninety-nine million, one hundred thirty-two thousand, nine hundred twenty-eight".