208065281 has 2 divisors, whose sum is σ = 208065282. Its totient is φ = 208065280.

The previous prime is 208065269. The next prime is 208065311. The reversal of 208065281 is 182560802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207936400 + 128881 = 14420^2 + 359^2 .

It is a cyclic number.

It is not a de Polignac number, because 208065281 - 2¹⁰ = 208064257 is a prime.

It is a super-2 number, since 2×208065281² = 86582322315217922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (208065881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104032640 + 104032641.

It is an arithmetic number, because the mean of its divisors is an integer number (104032641).

Almost surely, 2^208065281 is an apocalyptic number.

It is an amenable number.

208065281 is a deficient number, since it is larger than the sum of its proper divisors (1).

208065281 is an equidigital number, since it uses as much as digits as its factorization.

208065281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 208065281 is about 14424.4681357754. The cubic root of 208065281 is about 592.5611926805.

The spelling of 208065281 in words is "two hundred eight million, sixty-five thousand, two hundred eighty-one".