520812221 has 8 divisors (see below), whose sum is σ = 554834304. Its totient is φ = 487166400.

The previous prime is 520812197. The next prime is 520812223. The reversal of 520812221 is 122218025.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 520812221 - 2⁶ = 520812157 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520812223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91205 + ... + 96746.

It is an arithmetic number, because the mean of its divisors is an integer number (69354288).

Almost surely, 2^520812221 is an apocalyptic number.

It is an amenable number.

520812221 is a deficient number, since it is larger than the sum of its proper divisors (34022083).

520812221 is a wasteful number, since it uses less digits than its factorization.

520812221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188131.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 520812221 is about 22821.3106766461. The cubic root of 520812221 is about 804.5636156998.

The spelling of 520812221 in words is "five hundred twenty million, eight hundred twelve thousand, two hundred twenty-one".