206671697 has 2 divisors, whose sum is σ = 206671698. Its totient is φ = 206671696.

The previous prime is 206671691. The next prime is 206671723. The reversal of 206671697 is 796176602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145347136 + 61324561 = 12056^2 + 7831^2 .

It is a cyclic number.

It is not a de Polignac number, because 206671697 - 2⁴ = 206671681 is a prime.

It is not a weakly prime, because it can be changed into another prime (206671691) 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, 103335848 + 103335849.

It is an arithmetic number, because the mean of its divisors is an integer number (103335849).

Almost surely, 2^206671697 is an apocalyptic number.

It is an amenable number.

206671697 is a deficient number, since it is larger than the sum of its proper divisors (1).

206671697 is an equidigital number, since it uses as much as digits as its factorization.

206671697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 44.

The square root of 206671697 is about 14376.0807245925. The cubic root of 206671697 is about 591.2352717406.

The spelling of 206671697 in words is "two hundred six million, six hundred seventy-one thousand, six hundred ninety-seven".