208420669 has 2 divisors, whose sum is σ = 208420670. Its totient is φ = 208420668.

The previous prime is 208420649. The next prime is 208420673. The reversal of 208420669 is 966024802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206496900 + 1923769 = 14370^2 + 1387^2 .

It is a cyclic number.

It is not a de Polignac number, because 208420669 - 2⁵ = 208420637 is a prime.

It is a super-2 number, since 2×208420669² = 86878350532815122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208420649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104210334 + 104210335.

It is an arithmetic number, because the mean of its divisors is an integer number (104210335).

Almost surely, 2^208420669 is an apocalyptic number.

It is an amenable number.

208420669 is a deficient number, since it is larger than the sum of its proper divisors (1).

208420669 is an equidigital number, since it uses as much as digits as its factorization.

208420669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 208420669 is about 14436.7818089767. The cubic root of 208420669 is about 592.8983774816.

The spelling of 208420669 in words is "two hundred eight million, four hundred twenty thousand, six hundred sixty-nine".