520217353 has 2 divisors, whose sum is σ = 520217354. Its totient is φ = 520217352.

The previous prime is 520217303. The next prime is 520217387. The reversal of 520217353 is 353712025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 518609529 + 1607824 = 22773^2 + 1268^2 .

It is a cyclic number.

It is not a de Polignac number, because 520217353 - 2²⁵ = 486662921 is a prime.

It is not a weakly prime, because it can be changed into another prime (520217303) 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, 260108676 + 260108677.

It is an arithmetic number, because the mean of its divisors is an integer number (260108677).

Almost surely, 2^520217353 is an apocalyptic number.

It is an amenable number.

520217353 is a deficient number, since it is larger than the sum of its proper divisors (1).

520217353 is an equidigital number, since it uses as much as digits as its factorization.

520217353 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6300, while the sum is 28.

The square root of 520217353 is about 22808.2737838706. The cubic root of 520217353 is about 804.2571767271.

Adding to 520217353 its reverse (353712025), we get a palindrome (873929378).

The spelling of 520217353 in words is "five hundred twenty million, two hundred seventeen thousand, three hundred fifty-three".