520245217 has 4 divisors (see below), whose sum is σ = 521169840. Its totient is φ = 519320596.

The previous prime is 520245179. The next prime is 520245221. The reversal of 520245217 is 712542025.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520245217 is a prime.

It is a super-2 number, since 2×520245217² = 541310171622754178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520245287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 461467 + ... + 462592.

It is an arithmetic number, because the mean of its divisors is an integer number (130292460).

Almost surely, 2^520245217 is an apocalyptic number.

It is an amenable number.

520245217 is a deficient number, since it is larger than the sum of its proper divisors (924623).

520245217 is an equidigital number, since it uses as much as digits as its factorization.

520245217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924622.

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 520245217 is about 22808.8846066615. The cubic root of 520245217 is about 804.2715357392.

The spelling of 520245217 in words is "five hundred twenty million, two hundred forty-five thousand, two hundred seventeen".