206355641 has 2 divisors, whose sum is σ = 206355642. Its totient is φ = 206355640.

The previous prime is 206355631. The next prime is 206355649. The reversal of 206355641 is 146553602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201498025 + 4857616 = 14195^2 + 2204^2 .

It is a cyclic number.

It is not a de Polignac number, because 206355641 - 2¹⁸ = 206093497 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 206355598 and 206355607.

It is not a weakly prime, because it can be changed into another prime (206355649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103177820 + 103177821.

It is an arithmetic number, because the mean of its divisors is an integer number (103177821).

Almost surely, 2^206355641 is an apocalyptic number.

It is an amenable number.

206355641 is a deficient number, since it is larger than the sum of its proper divisors (1).

206355641 is an equidigital number, since it uses as much as digits as its factorization.

206355641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 206355641 is about 14365.0840930361. The cubic root of 206355641 is about 590.9337326435.

The spelling of 206355641 in words is "two hundred six million, three hundred fifty-five thousand, six hundred forty-one".