206696617 has 2 divisors, whose sum is σ = 206696618. Its totient is φ = 206696616.

The previous prime is 206696603. The next prime is 206696629. The reversal of 206696617 is 716696602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205893801 + 802816 = 14349^2 + 896^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206696617 is a prime.

It is not a weakly prime, because it can be changed into another prime (206696417) 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, 103348308 + 103348309.

It is an arithmetic number, because the mean of its divisors is an integer number (103348309).

Almost surely, 2^206696617 is an apocalyptic number.

It is an amenable number.

206696617 is a deficient number, since it is larger than the sum of its proper divisors (1).

206696617 is an equidigital number, since it uses as much as digits as its factorization.

206696617 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 43.

The square root of 206696617 is about 14376.9474159155. The cubic root of 206696617 is about 591.2590340506.

The spelling of 206696617 in words is "two hundred six million, six hundred ninety-six thousand, six hundred seventeen".