528680221 has 2 divisors, whose sum is σ = 528680222. Its totient is φ = 528680220.

The previous prime is 528680219. The next prime is 528680249. The reversal of 528680221 is 122086825.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 329023321 + 199656900 = 18139^2 + 14130^2 .

It is a cyclic number.

It is not a de Polignac number, because 528680221 - 2¹ = 528680219 is a prime.

Together with 528680219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (528680291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 264340110 + 264340111.

It is an arithmetic number, because the mean of its divisors is an integer number (264340111).

Almost surely, 2^528680221 is an apocalyptic number.

It is an amenable number.

528680221 is a deficient number, since it is larger than the sum of its proper divisors (1).

528680221 is an equidigital number, since it uses as much as digits as its factorization.

528680221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 528680221 is about 22993.0472317177. The cubic root of 528680221 is about 808.5949431004.

The spelling of 528680221 in words is "five hundred twenty-eight million, six hundred eighty thousand, two hundred twenty-one".