208697224249 has 2 divisors, whose sum is σ = 208697224250. Its totient is φ = 208697224248.

The previous prime is 208697224223. The next prime is 208697224271. The reversal of 208697224249 is 942422796802.

208697224249 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133707235600 + 74989988649 = 365660^2 + 273843^2 .

It is a cyclic number.

It is not a de Polignac number, because 208697224249 - 2⁹ = 208697223737 is a prime.

It is a super-2 number, since 2×208697224249² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 208697224249.

It is not a weakly prime, because it can be changed into another prime (208697224649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104348612124 + 104348612125.

It is an arithmetic number, because the mean of its divisors is an integer number (104348612125).

Almost surely, 2^208697224249 is an apocalyptic number.

It is an amenable number.

208697224249 is a deficient number, since it is larger than the sum of its proper divisors (1).

208697224249 is an equidigital number, since it uses as much as digits as its factorization.

208697224249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6967296, while the sum is 55.

The spelling of 208697224249 in words is "two hundred eight billion, six hundred ninety-seven million, two hundred twenty-four thousand, two hundred forty-nine".