520210217 has 8 divisors (see below), whose sum is σ = 553610376. Its totient is φ = 487121152.

The previous prime is 520210199. The next prime is 520210231. The reversal of 520210217 is 712012025.

It can be written as a sum of positive squares in 4 ways, for example, as 371101696 + 149108521 = 19264^2 + 12211^2 .

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 520210217 - 2⁶ = 520210153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520210247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74318 + ... + 81015.

It is an arithmetic number, because the mean of its divisors is an integer number (69201297).

Almost surely, 2^520210217 is an apocalyptic number.

It is an amenable number.

520210217 is a deficient number, since it is larger than the sum of its proper divisors (33400159).

520210217 is a wasteful number, since it uses less digits than its factorization.

520210217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155547.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 520210217 is about 22808.1173488738. The cubic root of 520210217 is about 804.2534992863.

The spelling of 520210217 in words is "five hundred twenty million, two hundred ten thousand, two hundred seventeen".