1091099399111 has 4 divisors (see below), whose sum is σ = 1091111949672. Its totient is φ = 1091086848552.

The previous prime is 1091099399063. The next prime is 1091099399123. The reversal of 1091099399111 is 1119939901901.

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 1091099399111 - 2²⁶ = 1091032290247 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 (1091099399711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6143960 + ... + 6319053.

It is an arithmetic number, because the mean of its divisors is an integer number (272777987418).

Almost surely, 2^{1091099399111} is an apocalyptic number.

1091099399111 is a deficient number, since it is larger than the sum of its proper divisors (12550561).

1091099399111 is an equidigital number, since it uses as much as digits as its factorization.

1091099399111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12550560.

The product of its (nonzero) digits is 177147, while the sum is 53.

The spelling of 1091099399111 in words is "one trillion, ninety-one billion, ninety-nine million, three hundred ninety-nine thousand, one hundred eleven".