191128 has 16 divisors (see below), whose sum is σ = 409680. Its totient is φ = 81888.

The previous prime is 191123. The next prime is 191137. The reversal of 191128 is 821191.

191128 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 191099 and 191108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191123) 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, 1651 + ... + 1762.

It is an arithmetic number, because the mean of its divisors is an integer number (25605).

2¹⁹¹¹²⁸ is an apocalyptic number.

It is an amenable number.

191128 is an abundant number, since it is smaller than the sum of its proper divisors (218552).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191128 is a wasteful number, since it uses less digits than its factorization.

191128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3426 (or 3422 counting only the distinct ones).

The product of its digits is 144, while the sum is 22.

The square root of 191128 is about 437.1818843456. The cubic root of 191128 is about 57.6025140364.

The spelling of 191128 in words is "one hundred ninety-one thousand, one hundred twenty-eight".