2191128 has 16 divisors (see below), whose sum is σ = 5477880. Its totient is φ = 730368.

The previous prime is 2191127. The next prime is 2191159. The reversal of 2191128 is 8211912.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 91297 = 2191128 / (2 + 1 + 9 + 1 + 1 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 2191098 and 2191107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191121) 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, 45625 + ... + 45672.

2^2191128 is an apocalyptic number.

It is an amenable number.

2191128 is an abundant number, since it is smaller than the sum of its proper divisors (3286752).

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

2191128 is a wasteful number, since it uses less digits than its factorization.

2191128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91306 (or 91302 counting only the distinct ones).

The product of its digits is 288, while the sum is 24.

The square root of 2191128 is about 1480.2459255137. The cubic root of 2191128 is about 129.8840781220.

The spelling of 2191128 in words is "two million, one hundred ninety-one thousand, one hundred twenty-eight".