517712221 has 8 divisors (see below), whose sum is σ = 581777280. Its totient is φ = 457110192.

The previous prime is 517712219. The next prime is 517712227. The reversal of 517712221 is 122217715.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 517712221 - 2¹ = 517712219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 517712221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (517712227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 865441 + ... + 866038.

It is an arithmetic number, because the mean of its divisors is an integer number (72722160).

Almost surely, 2^517712221 is an apocalyptic number.

It is an amenable number.

517712221 is a deficient number, since it is larger than the sum of its proper divisors (64065059).

517712221 is a wasteful number, since it uses less digits than its factorization.

517712221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1731515.

The product of its digits is 1960, while the sum is 28.

The square root of 517712221 is about 22753.2903334880. The cubic root of 517712221 is about 802.9641190381.

Adding to 517712221 its reverse (122217715), we get a palindrome (639929936).

The spelling of 517712221 in words is "five hundred seventeen million, seven hundred twelve thousand, two hundred twenty-one".