206843213 has 2 divisors, whose sum is σ = 206843214. Its totient is φ = 206843212.

The previous prime is 206843207. The next prime is 206843239. The reversal of 206843213 is 312348602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183927844 + 22915369 = 13562^2 + 4787^2 .

It is a cyclic number.

It is not a de Polignac number, because 206843213 - 2⁶ = 206843149 is a prime.

It is a super-2 number, since 2×206843213² = 85568229528326738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206843243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103421606 + 103421607.

It is an arithmetic number, because the mean of its divisors is an integer number (103421607).

Almost surely, 2^206843213 is an apocalyptic number.

It is an amenable number.

206843213 is a deficient number, since it is larger than the sum of its proper divisors (1).

206843213 is an equidigital number, since it uses as much as digits as its factorization.

206843213 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 29.

The square root of 206843213 is about 14382.0448128908. The cubic root of 206843213 is about 591.3987810987.

The spelling of 206843213 in words is "two hundred six million, eight hundred forty-three thousand, two hundred thirteen".