208399117 has 2 divisors, whose sum is σ = 208399118. Its totient is φ = 208399116.

The previous prime is 208399111. The next prime is 208399153. The reversal of 208399117 is 711993802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205234276 + 3164841 = 14326^2 + 1779^2 .

It is a cyclic number.

It is not a de Polignac number, because 208399117 - 2¹¹ = 208397069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 208399117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208399111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104199558 + 104199559.

It is an arithmetic number, because the mean of its divisors is an integer number (104199559).

Almost surely, 2^208399117 is an apocalyptic number.

It is an amenable number.

208399117 is a deficient number, since it is larger than the sum of its proper divisors (1).

208399117 is an equidigital number, since it uses as much as digits as its factorization.

208399117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 208399117 is about 14436.0353629381. The cubic root of 208399117 is about 592.8779403110.

The spelling of 208399117 in words is "two hundred eight million, three hundred ninety-nine thousand, one hundred seventeen".