208388897 has 2 divisors, whose sum is σ = 208388898. Its totient is φ = 208388896.

The previous prime is 208388893. The next prime is 208388899. The reversal of 208388897 is 798883802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205091041 + 3297856 = 14321^2 + 1816^2 .

It is a cyclic number.

It is not a de Polignac number, because 208388897 - 2² = 208388893 is a prime.

Together with 208388899, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (208388891) 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, 104194448 + 104194449.

It is an arithmetic number, because the mean of its divisors is an integer number (104194449).

Almost surely, 2^208388897 is an apocalyptic number.

It is an amenable number.

208388897 is a deficient number, since it is larger than the sum of its proper divisors (1).

208388897 is an equidigital number, since it uses as much as digits as its factorization.

208388897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1548288, while the sum is 53.

The square root of 208388897 is about 14435.6813832947. The cubic root of 208388897 is about 592.8682484727.

The spelling of 208388897 in words is "two hundred eight million, three hundred eighty-eight thousand, eight hundred ninety-seven".