520221217 has 2 divisors, whose sum is σ = 520221218. Its totient is φ = 520221216.

The previous prime is 520221209. The next prime is 520221253. The reversal of 520221217 is 712122025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 318836736 + 201384481 = 17856^2 + 14191^2 .

It is a cyclic number.

It is not a de Polignac number, because 520221217 - 2³ = 520221209 is a prime.

It is a super-2 number, since 2×520221217² = 541260229233922178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (520221277) 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, 260110608 + 260110609.

It is an arithmetic number, because the mean of its divisors is an integer number (260110609).

Almost surely, 2^520221217 is an apocalyptic number.

It is an amenable number.

520221217 is a deficient number, since it is larger than the sum of its proper divisors (1).

520221217 is an equidigital number, since it uses as much as digits as its factorization.

520221217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 520221217 is about 22808.3584898168. The cubic root of 520221217 is about 804.2591679730.

The spelling of 520221217 in words is "five hundred twenty million, two hundred twenty-one thousand, two hundred seventeen".