201128 has 16 divisors (see below), whose sum is σ = 389760. Its totient is φ = 97200.

The previous prime is 201121. The next prime is 201139. The reversal of 201128 is 821102.

201128 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (201121) by changing a digit.

201128 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158 + ... + 653.

It is an arithmetic number, because the mean of its divisors is an integer number (24360).

2²⁰¹¹²⁸ is an apocalyptic number.

It is an amenable number.

201128 is a deficient number, since it is larger than the sum of its proper divisors (188632).

201128 is a wasteful number, since it uses less digits than its factorization.

201128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848 (or 844 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 201128 is about 448.4729646255. The cubic root of 201128 is about 58.5900917835.

The spelling of 201128 in words is "two hundred one thousand, one hundred twenty-eight".