206864081 has 2 divisors, whose sum is σ = 206864082. Its totient is φ = 206864080.

The previous prime is 206864033. The next prime is 206864087. The reversal of 206864081 is 180468602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206209600 + 654481 = 14360^2 + 809^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206864081 is a prime.

It is a super-2 number, since 2×206864081² = 85585496015949122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (206864087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103432040 + 103432041.

It is an arithmetic number, because the mean of its divisors is an integer number (103432041).

Almost surely, 2^206864081 is an apocalyptic number.

It is an amenable number.

206864081 is a deficient number, since it is larger than the sum of its proper divisors (1).

206864081 is an equidigital number, since it uses as much as digits as its factorization.

206864081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 206864081 is about 14382.7702825290. The cubic root of 206864081 is about 591.4186687785.

The spelling of 206864081 in words is "two hundred six million, eight hundred sixty-four thousand, eighty-one".