208056857 has 2 divisors, whose sum is σ = 208056858. Its totient is φ = 208056856.

The previous prime is 208056839. The next prime is 208056881. The reversal of 208056857 is 758650802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187662601 + 20394256 = 13699^2 + 4516^2 .

It is a cyclic number.

It is not a de Polignac number, because 208056857 - 2²⁰ = 207008281 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (208056887) 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, 104028428 + 104028429.

It is an arithmetic number, because the mean of its divisors is an integer number (104028429).

Almost surely, 2^208056857 is an apocalyptic number.

It is an amenable number.

208056857 is a deficient number, since it is larger than the sum of its proper divisors (1).

208056857 is an equidigital number, since it uses as much as digits as its factorization.

208056857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 134400, while the sum is 41.

The square root of 208056857 is about 14424.1761289857. The cubic root of 208056857 is about 592.5531955064.

The spelling of 208056857 in words is "two hundred eight million, fifty-six thousand, eight hundred fifty-seven".