11155428891 has 16 divisors (see below), whose sum is σ = 16690194720. Its totient is φ = 7363317600.

The previous prime is 11155428887. The next prime is 11155428901. The reversal of 11155428891 is 19882455111.

11155428891 is a `hidden beast` number, since 1 + 1 + 1 + 554 + 2 + 8 + 8 + 91 = 666.

11155428891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11155428891 - 2² = 11155428887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11155418891) 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 15 ways as a sum of consecutive naturals, for example, 2042640 + ... + 2048093.

It is an arithmetic number, because the mean of its divisors is an integer number (1043137170).

Almost surely, 2^11155428891 is an apocalyptic number.

11155428891 is a deficient number, since it is larger than the sum of its proper divisors (5534765829).

11155428891 is a wasteful number, since it uses less digits than its factorization.

11155428891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4090843 (or 4090837 counting only the distinct ones).

The product of its digits is 115200, while the sum is 45.

The spelling of 11155428891 in words is "eleven billion, one hundred fifty-five million, four hundred twenty-eight thousand, eight hundred ninety-one".