208242191 has 2 divisors, whose sum is σ = 208242192. Its totient is φ = 208242190.

The previous prime is 208242149. The next prime is 208242233. The reversal of 208242191 is 191242802.

It is a balanced prime because it is at equal distance from previous prime (208242149) and next prime (208242233).

It is a cyclic number.

It is not a de Polignac number, because 208242191 - 2²² = 204047887 is a prime.

It is a super-2 number, since 2×208242191² = 86729620224960962, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208242791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104121095 + 104121096.

It is an arithmetic number, because the mean of its divisors is an integer number (104121096).

Almost surely, 2^208242191 is an apocalyptic number.

208242191 is a deficient number, since it is larger than the sum of its proper divisors (1).

208242191 is an equidigital number, since it uses as much as digits as its factorization.

208242191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 208242191 is about 14430.5991213116. The cubic root of 208242191 is about 592.7290891906.

Adding to 208242191 its reverse (191242802), we get a palindrome (399484993).

The spelling of 208242191 in words is "two hundred eight million, two hundred forty-two thousand, one hundred ninety-one".