811043 has 4 divisors (see below), whose sum is σ = 839040. Its totient is φ = 783048.

The previous prime is 811039. The next prime is 811067. The reversal of 811043 is 340118.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 811043 - 2² = 811039 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (814043) by changing a digit.

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, 13955 + ... + 14012.

It is an arithmetic number, because the mean of its divisors is an integer number (209760).

2⁸¹¹⁰⁴³ is an apocalyptic number.

811043 is a deficient number, since it is larger than the sum of its proper divisors (27997).

811043 is a wasteful number, since it uses less digits than its factorization.

811043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27996.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 811043 is about 900.5792580334. The cubic root of 811043 is about 93.2569684313.

The spelling of 811043 in words is "eight hundred eleven thousand, forty-three".