208097257 has 2 divisors, whose sum is σ = 208097258. Its totient is φ = 208097256.

The previous prime is 208097251. The next prime is 208097293. The reversal of 208097257 is 752790802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202663696 + 5433561 = 14236^2 + 2331^2 .

It is a cyclic number.

It is not a de Polignac number, because 208097257 - 2³ = 208097249 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (208097251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104048628 + 104048629.

It is an arithmetic number, because the mean of its divisors is an integer number (104048629).

Almost surely, 2^208097257 is an apocalyptic number.

It is an amenable number.

208097257 is a deficient number, since it is larger than the sum of its proper divisors (1).

208097257 is an equidigital number, since it uses as much as digits as its factorization.

208097257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 208097257 is about 14425.5764876139. The cubic root of 208097257 is about 592.5915465612.

The spelling of 208097257 in words is "two hundred eight million, ninety-seven thousand, two hundred fifty-seven".