517221868 has 6 divisors (see below), whose sum is σ = 905138276. Its totient is φ = 258610932.

The previous prime is 517221841. The next prime is 517221869. The reversal of 517221868 is 868122715.

It is a self number, because there is not a number n which added to its sum of digits gives 517221868.

It is not an unprimeable number, because it can be changed into a prime (517221869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64652730 + ... + 64652737.

Almost surely, 2^517221868 is an apocalyptic number.

It is an amenable number.

517221868 is a deficient number, since it is larger than the sum of its proper divisors (387916408).

517221868 is a wasteful number, since it uses less digits than its factorization.

517221868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129305471 (or 129305469 counting only the distinct ones).

The product of its digits is 53760, while the sum is 40.

The square root of 517221868 is about 22742.5123502220. The cubic root of 517221868 is about 802.7105288365.

The spelling of 517221868 in words is "five hundred seventeen million, two hundred twenty-one thousand, eight hundred sixty-eight".