208306997 has 2 divisors, whose sum is σ = 208306998. Its totient is φ = 208306996.

The previous prime is 208306979. The next prime is 208307027. The reversal of 208306997 is 799603802.

Together with previous prime (208306979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152744881 + 55562116 = 12359^2 + 7454^2 .

It is a cyclic number.

It is not a de Polignac number, because 208306997 - 2¹⁰ = 208305973 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208306097) 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, 104153498 + 104153499.

It is an arithmetic number, because the mean of its divisors is an integer number (104153499).

Almost surely, 2^208306997 is an apocalyptic number.

It is an amenable number.

208306997 is a deficient number, since it is larger than the sum of its proper divisors (1).

208306997 is an equidigital number, since it uses as much as digits as its factorization.

208306997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 208306997 is about 14432.8443835579. The cubic root of 208306997 is about 592.7905695549.

The spelling of 208306997 in words is "two hundred eight million, three hundred six thousand, nine hundred ninety-seven".