517221872 has 20 divisors (see below), whose sum is σ = 1061066016. Its totient is φ = 243398400.

The previous prime is 517221869. The next prime is 517221883. The reversal of 517221872 is 278122715.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 950504 + ... + 951047.

Almost surely, 2^517221872 is an apocalyptic number.

It is an amenable number.

517221872 is an abundant number, since it is smaller than the sum of its proper divisors (543844144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

517221872 is a wasteful number, since it uses less digits than its factorization.

517221872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901576 (or 1901570 counting only the distinct ones).

The product of its digits is 15680, while the sum is 35.

The square root of 517221872 is about 22742.5124381630. The cubic root of 517221872 is about 802.7105309058.

The spelling of 517221872 in words is "five hundred seventeen million, two hundred twenty-one thousand, eight hundred seventy-two".