208303681 has 2 divisors, whose sum is σ = 208303682. Its totient is φ = 208303680.

The previous prime is 208303679. The next prime is 208303721. The reversal of 208303681 is 186303802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206899456 + 1404225 = 14384^2 + 1185^2 .

It is a cyclic number.

It is not a de Polignac number, because 208303681 - 2¹ = 208303679 is a prime.

It is a super-2 number, since 2×208303681² = 86780847036299522, which contains 22 as substring.

Together with 208303679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (208303181) 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, 104151840 + 104151841.

It is an arithmetic number, because the mean of its divisors is an integer number (104151841).

Almost surely, 2^208303681 is an apocalyptic number.

It is an amenable number.

208303681 is a deficient number, since it is larger than the sum of its proper divisors (1).

208303681 is an equidigital number, since it uses as much as digits as its factorization.

208303681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 208303681 is about 14432.7295062299. The cubic root of 208303681 is about 592.7874240310.

The spelling of 208303681 in words is "two hundred eight million, three hundred three thousand, six hundred eighty-one".