206443261 has 2 divisors, whose sum is σ = 206443262. Its totient is φ = 206443260.

The previous prime is 206443247. The next prime is 206443277. The reversal of 206443261 is 162344602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165611161 + 40832100 = 12869^2 + 6390^2 .

It is a cyclic number.

It is not a de Polignac number, because 206443261 - 2¹³ = 206435069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206443231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103221630 + 103221631.

It is an arithmetic number, because the mean of its divisors is an integer number (103221631).

Almost surely, 2^206443261 is an apocalyptic number.

It is an amenable number.

206443261 is a deficient number, since it is larger than the sum of its proper divisors (1).

206443261 is an equidigital number, since it uses as much as digits as its factorization.

206443261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 206443261 is about 14368.1335252704. The cubic root of 206443261 is about 591.0173589610.

Adding to 206443261 its reverse (162344602), we get a palindrome (368787863).

The spelling of 206443261 in words is "two hundred six million, four hundred forty-three thousand, two hundred sixty-one".