520051221 has 6 divisors (see below), whose sum is σ = 751185110. Its totient is φ = 346700808.

The previous prime is 520051219. The next prime is 520051283. The reversal of 520051221 is 122150025.

It can be written as a sum of positive squares in only one way, i.e., 518063121 + 1988100 = 22761^2 + 1410^2 .

It is not a de Polignac number, because 520051221 - 2¹ = 520051219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 520051194 and 520051203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520051921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28891726 + ... + 28891743.

Almost surely, 2^520051221 is an apocalyptic number.

It is an amenable number.

520051221 is a deficient number, since it is larger than the sum of its proper divisors (231133889).

520051221 is a wasteful number, since it uses less digits than its factorization.

520051221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57783475 (or 57783472 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 520051221 is about 22804.6315690475. The cubic root of 520051221 is about 804.1715541322.

The spelling of 520051221 in words is "five hundred twenty million, fifty-one thousand, two hundred twenty-one".