520521 has 16 divisors (see below), whose sum is σ = 744960. Its totient is φ = 322560.

The previous prime is 520451. The next prime is 520529. The reversal of 520521 is 125025.

It is not a de Polignac number, because 520521 - 2⁷ = 520393 is a prime.

It is a super-2 number, since 2×520521² = 541884222882, which contains 22 as substring.

520521 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 520521.

It is not an unprimeable number, because it can be changed into a prime (520529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2601 + ... + 2793.

It is an arithmetic number, because the mean of its divisors is an integer number (46560).

2⁵²⁰⁵²¹ is an apocalyptic number.

520521 is the 386-th nonagonal number.

It is an amenable number.

520521 is a deficient number, since it is larger than the sum of its proper divisors (224439).

520521 is a wasteful number, since it uses less digits than its factorization.

520521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256.

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 520521 is about 721.4714131551. The cubic root of 520521 is about 80.4413625936.

Adding to 520521 its reverse (125025), we get a palindrome (645546).

The spelling of 520521 in words is "five hundred twenty thousand, five hundred twenty-one".