10991109011 has 4 divisors (see below), whose sum is σ = 11370112800. Its totient is φ = 10612105224.

The previous prime is 10991108987. The next prime is 10991109043. The reversal of 10991109011 is 11090119901.

10991109011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 10991109011 - 2²² = 10986914707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10991109211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189501851 + ... + 189501908.

It is an arithmetic number, because the mean of its divisors is an integer number (2842528200).

Almost surely, 2^10991109011 is an apocalyptic number.

10991109011 is a deficient number, since it is larger than the sum of its proper divisors (379003789).

10991109011 is an equidigital number, since it uses as much as digits as its factorization.

10991109011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379003788.

The product of its (nonzero) digits is 729, while the sum is 32.

The spelling of 10991109011 in words is "ten billion, nine hundred ninety-one million, one hundred nine thousand, eleven".