208317348839209 has 9 divisors (see below), whose sum is σ = 210401790454839. Its totient is φ = 206253357510600.

The previous prime is 208317348839207. The next prime is 208317348839213. The reversal of 208317348839209 is 902938843713802.

The square root of 208317348839209 is 14433203.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 200148841875609 + 8168506963600 = 14147397^2 + 2858060^2 .

It is not a de Polignac number, because 208317348839209 - 2¹ = 208317348839207 is a prime.

It is a super-2 number, since 2×208317348839209² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208317348839207) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1457682052 + ... + 1457824954.

Almost surely, 2^{208317348839209} is an apocalyptic number.

208317348839209 is the 14433203-rd square number.

208317348839209 is the 7216602-nd centered octagonal number.

It is an amenable number.

208317348839209 is a deficient number, since it is larger than the sum of its proper divisors (2084441615630).

208317348839209 is an frugal number, since it uses more digits than its factorization.

208317348839209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286008 (or 143004 counting only the distinct ones).

The product of its (nonzero) digits is 125411328, while the sum is 67.

The spelling of 208317348839209 in words is "two hundred eight trillion, three hundred seventeen billion, three hundred forty-eight million, eight hundred thirty-nine thousand, two hundred nine".