208663397 has 2 divisors, whose sum is σ = 208663398. Its totient is φ = 208663396.

The previous prime is 208663333. The next prime is 208663421. The reversal of 208663397 is 793366802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142826401 + 65836996 = 11951^2 + 8114^2 .

It is a cyclic number.

It is not a de Polignac number, because 208663397 - 2⁶ = 208663333 is a 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 (208663297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104331698 + 104331699.

It is an arithmetic number, because the mean of its divisors is an integer number (104331699).

Almost surely, 2^208663397 is an apocalyptic number.

It is an amenable number.

208663397 is a deficient number, since it is larger than the sum of its proper divisors (1).

208663397 is an equidigital number, since it uses as much as digits as its factorization.

208663397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 44.

The square root of 208663397 is about 14445.1859454976. The cubic root of 208663397 is about 593.1284525614.

The spelling of 208663397 in words is "two hundred eight million, six hundred sixty-three thousand, three hundred ninety-seven".