1128831 has 16 divisors (see below), whose sum is σ = 1666560. Its totient is φ = 673920.

The previous prime is 1128823. The next prime is 1128889. The reversal of 1128831 is 1388211.

It is not a de Polignac number, because 1128831 - 2³ = 1128823 is a prime.

It is a super-2 number, since 2×1128831² = 2548518853122, which contains 22 as substring.

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 (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2391 + ... + 2823.

It is an arithmetic number, because the mean of its divisors is an integer number (104160).

2^1128831 is an apocalyptic number.

1128831 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1128831 is a deficient number, since it is larger than the sum of its proper divisors (537729).

1128831 is a wasteful number, since it uses less digits than its factorization.

1128831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526.

The product of its digits is 384, while the sum is 24.

The square root of 1128831 is about 1062.4645876452. The cubic root of 1128831 is about 104.1221137115.

The spelling of 1128831 in words is "one million, one hundred twenty-eight thousand, eight hundred thirty-one".