521320 has 16 divisors (see below), whose sum is σ = 1173060. Its totient is φ = 208512.

The previous prime is 521317. The next prime is 521329. The reversal of 521320 is 23125.

It can be written as a sum of positive squares in 2 ways, for example, as 521284 + 36 = 722^2 + 6^2 .

It is a super-3 number, since 3×521320³ = 425044513331904000, which contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 521320.

It is not an unprimeable number, because it can be changed into a prime (521329) 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 3 ways as a sum of consecutive naturals, for example, 6477 + ... + 6556.

2⁵²¹³²⁰ is an apocalyptic number.

It is an amenable number.

521320 is an abundant number, since it is smaller than the sum of its proper divisors (651740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521320 is a wasteful number, since it uses less digits than its factorization.

521320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13044 (or 13040 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 521320 is about 722.0249303175. The cubic root of 521320 is about 80.4825007292.

Adding to 521320 its reverse (23125), we get a palindrome (544445).

It can be divided in two parts, 521 and 320, that added together give a square (841 = 29²).

The spelling of 521320 in words is "five hundred twenty-one thousand, three hundred twenty".