206868517 has 4 divisors (see below), whose sum is σ = 212459596. Its totient is φ = 201277440.

The previous prime is 206868469. The next prime is 206868533. The reversal of 206868517 is 715868602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 115971361 + 90897156 = 10769^2 + 9534^2 .

It is a cyclic number.

It is not a de Polignac number, because 206868517 - 2¹¹ = 206866469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206868217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2795484 + ... + 2795557.

It is an arithmetic number, because the mean of its divisors is an integer number (53114899).

Almost surely, 2^206868517 is an apocalyptic number.

It is an amenable number.

206868517 is a deficient number, since it is larger than the sum of its proper divisors (5591079).

206868517 is an equidigital number, since it uses as much as digits as its factorization.

206868517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5591078.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 206868517 is about 14382.9244939963. The cubic root of 206868517 is about 591.4228962153.

The spelling of 206868517 in words is "two hundred six million, eight hundred sixty-eight thousand, five hundred seventeen".