520078813 has 2 divisors, whose sum is σ = 520078814. Its totient is φ = 520078812.

The previous prime is 520078799. The next prime is 520078817. The reversal of 520078813 is 318870025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 262861369 + 257217444 = 16213^2 + 16038^2 .

It is a cyclic number.

It is not a de Polignac number, because 520078813 - 2⁵ = 520078781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520078817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260039406 + 260039407.

It is an arithmetic number, because the mean of its divisors is an integer number (260039407).

Almost surely, 2^520078813 is an apocalyptic number.

It is an amenable number.

520078813 is a deficient number, since it is larger than the sum of its proper divisors (1).

520078813 is an equidigital number, since it uses as much as digits as its factorization.

520078813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 520078813 is about 22805.2365258508. The cubic root of 520078813 is about 804.1857760064.

The spelling of 520078813 in words is "five hundred twenty million, seventy-eight thousand, eight hundred thirteen".