206636081 has 2 divisors, whose sum is σ = 206636082. Its totient is φ = 206636080.

The previous prime is 206636033. The next prime is 206636099. The reversal of 206636081 is 180636602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197149681 + 9486400 = 14041^2 + 3080^2 .

It is a cyclic number.

It is not a de Polignac number, because 206636081 - 2¹⁴ = 206619697 is a prime.

It is a super-2 number, since 2×206636081² = 85396939942077122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (206636011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103318040 + 103318041.

It is an arithmetic number, because the mean of its divisors is an integer number (103318041).

Almost surely, 2^206636081 is an apocalyptic number.

It is an amenable number.

206636081 is a deficient number, since it is larger than the sum of its proper divisors (1).

206636081 is an equidigital number, since it uses as much as digits as its factorization.

206636081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 206636081 is about 14374.8419469572. The cubic root of 206636081 is about 591.2013070106.

The spelling of 206636081 in words is "two hundred six million, six hundred thirty-six thousand, eighty-one".