520226813 has 2 divisors, whose sum is σ = 520226814. Its totient is φ = 520226812.

The previous prime is 520226803. The next prime is 520226873. The reversal of 520226813 is 318622025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 270997444 + 249229369 = 16462^2 + 15787^2 .

It is a cyclic number.

It is not a de Polignac number, because 520226813 - 2⁴ = 520226797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520226803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260113406 + 260113407.

It is an arithmetic number, because the mean of its divisors is an integer number (260113407).

Almost surely, 2^520226813 is an apocalyptic number.

It is an amenable number.

520226813 is a deficient number, since it is larger than the sum of its proper divisors (1).

520226813 is an equidigital number, since it uses as much as digits as its factorization.

520226813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 520226813 is about 22808.4811638127. The cubic root of 520226813 is about 804.2620517578.

Adding to 520226813 its reverse (318622025), we get a palindrome (838848838).

The spelling of 520226813 in words is "five hundred twenty million, two hundred twenty-six thousand, eight hundred thirteen".