520813 has 2 divisors, whose sum is σ = 520814. Its totient is φ = 520812.

The previous prime is 520787. The next prime is 520837. The reversal of 520813 is 318025.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 514089 + 6724 = 717^2 + 82^2 .

It is a cyclic number.

It is not a de Polignac number, because 520813 - 2¹³ = 512621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520853) 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 as a sum of consecutive naturals, namely, 260406 + 260407.

It is an arithmetic number, because the mean of its divisors is an integer number (260407).

2⁵²⁰⁸¹³ is an apocalyptic number.

It is an amenable number.

520813 is a deficient number, since it is larger than the sum of its proper divisors (1).

520813 is an equidigital number, since it uses as much as digits as its factorization.

520813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 520813 is about 721.6737490030. The cubic root of 520813 is about 80.4564016839.

Adding to 520813 its reverse (318025), we get a palindrome (838838).

The spelling of 520813 in words is "five hundred twenty thousand, eight hundred thirteen".