208855069 has 2 divisors, whose sum is σ = 208855070. Its totient is φ = 208855068.

The previous prime is 208855067. The next prime is 208855109. The reversal of 208855069 is 960558802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183954969 + 24900100 = 13563^2 + 4990^2 .

It is a cyclic number.

It is not a de Polignac number, because 208855069 - 2¹ = 208855067 is a prime.

It is a super-2 number, since 2×208855069² = 87240879693989522, which contains 22 as substring.

Together with 208855067, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208855067) 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, 104427534 + 104427535.

It is an arithmetic number, because the mean of its divisors is an integer number (104427535).

Almost surely, 2^208855069 is an apocalyptic number.

It is an amenable number.

208855069 is a deficient number, since it is larger than the sum of its proper divisors (1).

208855069 is an equidigital number, since it uses as much as digits as its factorization.

208855069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 43.

The square root of 208855069 is about 14451.8188820646. The cubic root of 208855069 is about 593.3100070435.

The spelling of 208855069 in words is "two hundred eight million, eight hundred fifty-five thousand, sixty-nine".