520819 has 4 divisors (see below), whose sum is σ = 560896. Its totient is φ = 480744.

The previous prime is 520813. The next prime is 520837. The reversal of 520819 is 918025.

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 520819 - 2⁵ = 520787 is a prime.

It is a super-2 number, since 2×520819² = 542504861522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 520793 and 520802.

It is a congruent number.

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, 20019 + ... + 20044.

It is an arithmetic number, because the mean of its divisors is an integer number (140224).

2⁵²⁰⁸¹⁹ is an apocalyptic number.

520819 is a deficient number, since it is larger than the sum of its proper divisors (40077).

520819 is a wasteful number, since it uses less digits than its factorization.

520819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40076.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 520819 is about 721.6779059941. The cubic root of 520819 is about 80.4567106474.

The spelling of 520819 in words is "five hundred twenty thousand, eight hundred nineteen".