1091000191100 has 36 divisors (see below), whose sum is σ = 2376472260624. Its totient is φ = 434740750080.

The previous prime is 1091000191033. The next prime is 1091000191109. The reversal of 1091000191100 is 11910001901.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091000191109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20715149 + ... + 20767748.

Almost surely, 2^{1091000191100} is an apocalyptic number.

1091000191100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1091000191100 is an abundant number, since it is smaller than the sum of its proper divisors (1285472069524).

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

1091000191100 is a wasteful number, since it uses less digits than its factorization.

1091000191100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41483174 (or 41483167 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 23.

The spelling of 1091000191100 in words is "one trillion, ninety-one billion, one hundred ninety-one thousand, one hundred".