811057 has 8 divisors (see below), whose sum is σ = 884520. Its totient is φ = 739200.

The previous prime is 811039. The next prime is 811067. The reversal of 811057 is 750118.

It can be written as a sum of positive squares in 4 ways, for example, as 43681 + 767376 = 209^2 + 876^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-811057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (811037) 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 7 ways as a sum of consecutive naturals, for example, 807 + ... + 1507.

It is an arithmetic number, because the mean of its divisors is an integer number (110565).

2⁸¹¹⁰⁵⁷ is an apocalyptic number.

It is an amenable number.

811057 is a deficient number, since it is larger than the sum of its proper divisors (73463).

811057 is a wasteful number, since it uses less digits than its factorization.

811057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803.

The product of its (nonzero) digits is 280, while the sum is 22.

The square root of 811057 is about 900.5870307749. The cubic root of 811057 is about 93.2575050202.

The spelling of 811057 in words is "eight hundred eleven thousand, fifty-seven".