1091101920191 has 4 divisors (see below), whose sum is σ = 1091111748192. Its totient is φ = 1091092092192.

The previous prime is 1091101920187. The next prime is 1091101920269. The reversal of 1091101920191 is 1910291011901.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1091101920191 - 2² = 1091101920187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091101922191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4745546 + ... + 4970151.

It is an arithmetic number, because the mean of its divisors is an integer number (272777937048).

Almost surely, 2^{1091101920191} is an apocalyptic number.

1091101920191 is a deficient number, since it is larger than the sum of its proper divisors (9828001).

1091101920191 is an equidigital number, since it uses as much as digits as its factorization.

1091101920191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9828000.

The product of its (nonzero) digits is 1458, while the sum is 35.

The spelling of 1091101920191 in words is "one trillion, ninety-one billion, one hundred one million, nine hundred twenty thousand, one hundred ninety-one".