2011128191 has 4 divisors (see below), whose sum is σ = 2016825792. Its totient is φ = 2005430592.

The previous prime is 2011128181. The next prime is 2011128199. The reversal of 2011128191 is 1918211102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2011128191 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2011128191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011128199) 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, 2848271 + ... + 2848976.

It is an arithmetic number, because the mean of its divisors is an integer number (504206448).

Almost surely, 2^2011128191 is an apocalyptic number.

2011128191 is a deficient number, since it is larger than the sum of its proper divisors (5697601).

2011128191 is an equidigital number, since it uses as much as digits as its factorization.

2011128191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5697600.

The product of its (nonzero) digits is 288, while the sum is 26.

The square root of 2011128191 is about 44845.6039205628. The cubic root of 2011128191 is about 1262.2535029132.

Adding to 2011128191 its reverse (1918211102), we get a palindrome (3929339293).

The spelling of 2011128191 in words is "two billion, eleven million, one hundred twenty-eight thousand, one hundred ninety-one".