206508161 has 2 divisors, whose sum is σ = 206508162. Its totient is φ = 206508160.

The previous prime is 206508151. The next prime is 206508173. The reversal of 206508161 is 161805602.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206468161 + 40000 = 14369^2 + 200^2 .

It is a cyclic number.

It is not a de Polignac number, because 206508161 - 2⁶ = 206508097 is a prime.

It is a super-3 number, since 3×206508161³ (a number of 26 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (206508151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103254080 + 103254081.

It is an arithmetic number, because the mean of its divisors is an integer number (103254081).

Almost surely, 2^206508161 is an apocalyptic number.

It is an amenable number.

206508161 is a deficient number, since it is larger than the sum of its proper divisors (1).

206508161 is an equidigital number, since it uses as much as digits as its factorization.

206508161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 206508161 is about 14370.3918179011. The cubic root of 206508161 is about 591.0792855934.

The spelling of 206508161 in words is "two hundred six million, five hundred eight thousand, one hundred sixty-one".