520221717 has 8 divisors (see below), whose sum is σ = 770698880. Its totient is φ = 346814460.

The previous prime is 520221683. The next prime is 520221721. The reversal of 520221717 is 717122025.

It is not a de Polignac number, because 520221717 - 2¹⁴ = 520205333 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 19267471 = 520221717 / (5 + 2 + 0 + 2 + 2 + 1 + 7 + 1 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520221217) 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, 9633709 + ... + 9633762.

It is an arithmetic number, because the mean of its divisors is an integer number (96337360).

Almost surely, 2^520221717 is an apocalyptic number.

It is an amenable number.

520221717 is a deficient number, since it is larger than the sum of its proper divisors (250477163).

520221717 is a wasteful number, since it uses less digits than its factorization.

520221717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19267480 (or 19267474 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 27.

The square root of 520221717 is about 22808.3694507082. The cubic root of 520221717 is about 804.2594256387.

The spelling of 520221717 in words is "five hundred twenty million, two hundred twenty-one thousand, seven hundred seventeen".