520313221 has 2 divisors, whose sum is σ = 520313222. Its totient is φ = 520313220.

The previous prime is 520313219. The next prime is 520313231. The reversal of 520313221 is 122313025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 514790721 + 5522500 = 22689^2 + 2350^2 .

It is a cyclic number.

It is not a de Polignac number, because 520313221 - 2¹ = 520313219 is a prime.

Together with 520313219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520313231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260156610 + 260156611.

It is an arithmetic number, because the mean of its divisors is an integer number (260156611).

Almost surely, 2^520313221 is an apocalyptic number.

It is an amenable number.

520313221 is a deficient number, since it is larger than the sum of its proper divisors (1).

520313221 is an equidigital number, since it uses as much as digits as its factorization.

520313221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 520313221 is about 22810.3752928355. The cubic root of 520313221 is about 804.3065777392.

Adding to 520313221 its reverse (122313025), we get a palindrome (642626246).

The spelling of 520313221 in words is "five hundred twenty million, three hundred thirteen thousand, two hundred twenty-one".