1128861 has 6 divisors (see below), whose sum is σ = 1630590. Its totient is φ = 752568.

The previous prime is 1128823. The next prime is 1128889. The reversal of 1128861 is 1688211.

It can be written as a sum of positive squares in only one way, i.e., 820836 + 308025 = 906^2 + 555^2 .

It is not a de Polignac number, because 1128861 - 2⁹ = 1128349 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62706 + ... + 62723.

It is an arithmetic number, because the mean of its divisors is an integer number (271765).

2^1128861 is an apocalyptic number.

It is an amenable number.

1128861 is a deficient number, since it is larger than the sum of its proper divisors (501729).

1128861 is a wasteful number, since it uses less digits than its factorization.

1128861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125435 (or 125432 counting only the distinct ones).

The product of its digits is 768, while the sum is 27.

The square root of 1128861 is about 1062.4787056690. The cubic root of 1128861 is about 104.1230360922.

The spelling of 1128861 in words is "one million, one hundred twenty-eight thousand, eight hundred sixty-one".