208940111 has 2 divisors, whose sum is σ = 208940112. Its totient is φ = 208940110.

The previous prime is 208940033. The next prime is 208940129. The reversal of 208940111 is 111049802.

208940111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208940111 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208940161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104470055 + 104470056.

It is an arithmetic number, because the mean of its divisors is an integer number (104470056).

Almost surely, 2^208940111 is an apocalyptic number.

208940111 is a deficient number, since it is larger than the sum of its proper divisors (1).

208940111 is an equidigital number, since it uses as much as digits as its factorization.

208940111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 208940111 is about 14454.7608420202. The cubic root of 208940111 is about 593.3905244778.

Adding to 208940111 its reverse (111049802), we get a palindrome (319989913).

The spelling of 208940111 in words is "two hundred eight million, nine hundred forty thousand, one hundred eleven".