520938221 has 2 divisors, whose sum is σ = 520938222. Its totient is φ = 520938220.

The previous prime is 520938217. The next prime is 520938233. The reversal of 520938221 is 122839025.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 310252996 + 210685225 = 17614^2 + 14515^2 .

It is a cyclic number.

It is not a de Polignac number, because 520938221 - 2² = 520938217 is a prime.

It is a Sophie Germain 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 (520938211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260469110 + 260469111.

It is an arithmetic number, because the mean of its divisors is an integer number (260469111).

Almost surely, 2^520938221 is an apocalyptic number.

It is an amenable number.

520938221 is a deficient number, since it is larger than the sum of its proper divisors (1).

520938221 is an equidigital number, since it uses as much as digits as its factorization.

520938221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 520938221 is about 22824.0710873411. The cubic root of 520938221 is about 804.6284931082.

The spelling of 520938221 in words is "five hundred twenty million, nine hundred thirty-eight thousand, two hundred twenty-one".