528221 has 4 divisors (see below), whose sum is σ = 531552. Its totient is φ = 524892.

The previous prime is 528217. The next prime is 528223. The reversal of 528221 is 122825.

528221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 528221 - 2² = 528217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 528193 and 528202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (528223) 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, 1415 + ... + 1748.

It is an arithmetic number, because the mean of its divisors is an integer number (132888).

2⁵²⁸²²¹ is an apocalyptic number.

It is an amenable number.

528221 is a deficient number, since it is larger than the sum of its proper divisors (3331).

528221 is a wasteful number, since it uses less digits than its factorization.

528221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3330.

The product of its digits is 320, while the sum is 20.

The square root of 528221 is about 726.7881396941. The cubic root of 528221 is about 80.8360755320.

The spelling of 528221 in words is "five hundred twenty-eight thousand, two hundred twenty-one".