520172017 has 2 divisors, whose sum is σ = 520172018. Its totient is φ = 520172016.

The previous prime is 520171997. The next prime is 520172053. The reversal of 520172017 is 710271025.

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., 324144016 + 196028001 = 18004^2 + 14001^2 .

It is a cyclic number.

It is not a de Polignac number, because 520172017 - 2¹⁹ = 519647729 is a prime.

It is equal to p_27361213 and since 520172017 and 27361213 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 520171982 and 520172000.

It is not a weakly prime, because it can be changed into another prime (520170017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260086008 + 260086009.

It is an arithmetic number, because the mean of its divisors is an integer number (260086009).

Almost surely, 2^520172017 is an apocalyptic number.

It is an amenable number.

520172017 is a deficient number, since it is larger than the sum of its proper divisors (1).

520172017 is an equidigital number, since it uses as much as digits as its factorization.

520172017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 520172017 is about 22807.2799123438. The cubic root of 520172017 is about 804.2338128630.

The spelling of 520172017 in words is "five hundred twenty million, one hundred seventy-two thousand, seventeen".