517393245221 has 2 divisors, whose sum is σ = 517393245222. Its totient is φ = 517393245220.

The previous prime is 517393245211. The next prime is 517393245233. The reversal of 517393245221 is 122542393715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 321245236225 + 196148008996 = 566785^2 + 442886^2 .

It is a cyclic number.

It is not a de Polignac number, because 517393245221 - 2²⁶ = 517326136357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (517393245211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258696622610 + 258696622611.

It is an arithmetic number, because the mean of its divisors is an integer number (258696622611).

Almost surely, 2^517393245221 is an apocalyptic number.

It is an amenable number.

517393245221 is a deficient number, since it is larger than the sum of its proper divisors (1).

517393245221 is an equidigital number, since it uses as much as digits as its factorization.

517393245221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 453600, while the sum is 44.

The spelling of 517393245221 in words is "five hundred seventeen billion, three hundred ninety-three million, two hundred forty-five thousand, two hundred twenty-one".