811045 has 4 divisors (see below), whose sum is σ = 973260. Its totient is φ = 648832.

The previous prime is 811039. The next prime is 811067. The reversal of 811045 is 540118.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 540118 = 2 ⋅270059.

It can be written as a sum of positive squares in 2 ways, for example, as 567009 + 244036 = 753^2 + 494^2 .

It is a cyclic number.

It is not a de Polignac number, because 811045 - 2³ = 811037 is a prime.

811045 is a lucky number.

It is a congruent number.

It is an unprimeable 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, 81100 + ... + 81109.

It is an arithmetic number, because the mean of its divisors is an integer number (243315).

2⁸¹¹⁰⁴⁵ is an apocalyptic number.

It is an amenable number.

811045 is a deficient number, since it is larger than the sum of its proper divisors (162215).

811045 is a wasteful number, since it uses less digits than its factorization.

811045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162214.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 811045 is about 900.5803684292. The cubic root of 811045 is about 93.2570450873.

The spelling of 811045 in words is "eight hundred eleven thousand, forty-five".