517217842 has 16 divisors (see below), whose sum is σ = 803439000. Its totient is φ = 249424000.

The previous prime is 517217821. The next prime is 517217849. The reversal of 517217842 is 248712715.

It can be written as a sum of positive squares in 4 ways, for example, as 442723681 + 74494161 = 21041^2 + 8631^2 .

It is not an unprimeable number, because it can be changed into a prime (517217849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56592 + ... + 65092.

Almost surely, 2^517217842 is an apocalyptic number.

517217842 is a deficient number, since it is larger than the sum of its proper divisors (286221158).

517217842 is a wasteful number, since it uses less digits than its factorization.

517217842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9581.

The product of its digits is 31360, while the sum is 37.

The square root of 517217842 is about 22742.4238374013. The cubic root of 517217842 is about 802.7084460933.

The spelling of 517217842 in words is "five hundred seventeen million, two hundred seventeen thousand, eight hundred forty-two".