528821 has 2 divisors, whose sum is σ = 528822. Its totient is φ = 528820.

The previous prime is 528811. The next prime is 528823. The reversal of 528821 is 128825.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 483025 + 45796 = 695^2 + 214^2 .

It is a cyclic number.

It is not a de Polignac number, because 528821 - 2¹⁸ = 266677 is a prime.

It is a Sophie Germain prime.

Together with 528823, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (528823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 264410 + 264411.

It is an arithmetic number, because the mean of its divisors is an integer number (264411).

2⁵²⁸⁸²¹ is an apocalyptic number.

It is an amenable number.

528821 is a deficient number, since it is larger than the sum of its proper divisors (1).

528821 is an equidigital number, since it uses as much as digits as its factorization.

528821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1280, while the sum is 26.

The square root of 528821 is about 727.2007975793. The cubic root of 528821 is about 80.8666708653.

The spelling of 528821 in words is "five hundred twenty-eight thousand, eight hundred twenty-one".