520811 has 4 divisors (see below), whose sum is σ = 538800. Its totient is φ = 502824.

The previous prime is 520787. The next prime is 520813. The reversal of 520811 is 118025.

520811 = T₆₃ + T₆₄ + ... + T₁₄₉.

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 520811 - 2⁶ = 520747 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 520811.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 520811.

It is not an unprimeable number, because it can be changed into a prime (520813) 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 3 ways as a sum of consecutive naturals, for example, 8951 + ... + 9008.

It is an arithmetic number, because the mean of its divisors is an integer number (134700).

2⁵²⁰⁸¹¹ is an apocalyptic number.

520811 is a deficient number, since it is larger than the sum of its proper divisors (17989).

520811 is a wasteful number, since it uses less digits than its factorization.

520811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17988.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 520811 is about 721.6723633339. The cubic root of 520811 is about 80.4562986956.

Adding to 520811 its reverse (118025), we get a palindrome (638836).

It can be divided in two parts, 520 and 811, that added together give a palindrome (1331).

The spelling of 520811 in words is "five hundred twenty thousand, eight hundred eleven".