520550221 has 4 divisors (see below), whose sum is σ = 521946172. Its totient is φ = 519154272.

The previous prime is 520550179. The next prime is 520550249. The reversal of 520550221 is 122055025.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 399440196 + 121110025 = 19986^2 + 11005^2 .

It is a cyclic number.

It is not a de Polignac number, because 520550221 - 2⁹ = 520549709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 520550192 and 520550201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520550281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 697416 + ... + 698161.

It is an arithmetic number, because the mean of its divisors is an integer number (130486543).

Almost surely, 2^520550221 is an apocalyptic number.

It is an amenable number.

520550221 is a deficient number, since it is larger than the sum of its proper divisors (1395951).

520550221 is a wasteful number, since it uses less digits than its factorization.

520550221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1395950.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 520550221 is about 22815.5697057952. The cubic root of 520550221 is about 804.4286783741.

The spelling of 520550221 in words is "five hundred twenty million, five hundred fifty thousand, two hundred twenty-one".