517138530617 has 2 divisors, whose sum is σ = 517138530618. Its totient is φ = 517138530616.

The previous prime is 517138530589. The next prime is 517138530637. The reversal of 517138530617 is 716035831715.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 436893238441 + 80245292176 = 660979^2 + 283276^2 .

It is a cyclic number.

It is not a de Polignac number, because 517138530617 - 2³⁸ = 242260623673 is a prime.

It is not a weakly prime, because it can be changed into another prime (517138530637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258569265308 + 258569265309.

It is an arithmetic number, because the mean of its divisors is an integer number (258569265309).

Almost surely, 2^517138530617 is an apocalyptic number.

It is an amenable number.

517138530617 is a deficient number, since it is larger than the sum of its proper divisors (1).

517138530617 is an equidigital number, since it uses as much as digits as its factorization.

517138530617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 529200, while the sum is 47.

The spelling of 517138530617 in words is "five hundred seventeen billion, one hundred thirty-eight million, five hundred thirty thousand, six hundred seventeen".