208620197 has 2 divisors, whose sum is σ = 208620198. Its totient is φ = 208620196.

The previous prime is 208620179. The next prime is 208620199. The reversal of 208620197 is 791026802.

It is a happy number.

Together with previous prime (208620179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208340356 + 279841 = 14434^2 + 529^2 .

It is a cyclic number.

It is not a de Polignac number, because 208620197 - 2²⁶ = 141511333 is a prime.

Together with 208620199, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208620199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104310098 + 104310099.

It is an arithmetic number, because the mean of its divisors is an integer number (104310099).

Almost surely, 2^208620197 is an apocalyptic number.

It is an amenable number.

208620197 is a deficient number, since it is larger than the sum of its proper divisors (1).

208620197 is an equidigital number, since it uses as much as digits as its factorization.

208620197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 208620197 is about 14443.6905602412. The cubic root of 208620197 is about 593.0875175468.

Adding to 208620197 its reverse (791026802), we get a palindrome (999646999).

The spelling of 208620197 in words is "two hundred eight million, six hundred twenty thousand, one hundred ninety-seven".