517663397 has 2 divisors, whose sum is σ = 517663398. Its totient is φ = 517663396.

The previous prime is 517663361. The next prime is 517663441. The reversal of 517663397 is 793366715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 502925476 + 14737921 = 22426^2 + 3839^2 .

It is a cyclic number.

It is not a de Polignac number, because 517663397 - 2²⁰ = 516614821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (517663297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258831698 + 258831699.

It is an arithmetic number, because the mean of its divisors is an integer number (258831699).

Almost surely, 2^517663397 is an apocalyptic number.

It is an amenable number.

517663397 is a deficient number, since it is larger than the sum of its proper divisors (1).

517663397 is an equidigital number, since it uses as much as digits as its factorization.

517663397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 714420, while the sum is 47.

The square root of 517663397 is about 22752.2174084198. The cubic root of 517663397 is about 802.9388764735.

The spelling of 517663397 in words is "five hundred seventeen million, six hundred sixty-three thousand, three hundred ninety-seven".