517020997 has 2 divisors, whose sum is σ = 517020998. Its totient is φ = 517020996.

The previous prime is 517020941. The next prime is 517021031. The reversal of 517020997 is 799020715.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 263542756 + 253478241 = 16234^2 + 15921^2 .

It is a cyclic number.

It is not a de Polignac number, because 517020997 - 2¹⁹ = 516496709 is a prime.

It is a super-2 number, since 2×517020997² = 534621422677748018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (517020797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258510498 + 258510499.

It is an arithmetic number, because the mean of its divisors is an integer number (258510499).

Almost surely, 2^517020997 is an apocalyptic number.

It is an amenable number.

517020997 is a deficient number, since it is larger than the sum of its proper divisors (1).

517020997 is an equidigital number, since it uses as much as digits as its factorization.

517020997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39690, while the sum is 40.

The square root of 517020997 is about 22738.0957206183. The cubic root of 517020997 is about 802.6066004229.

The spelling of 517020997 in words is "five hundred seventeen million, twenty thousand, nine hundred ninety-seven".