206681213 has 4 divisors (see below), whose sum is σ = 209592288. Its totient is φ = 203770140.

The previous prime is 206681203. The next prime is 206681219. The reversal of 206681213 is 312186602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 206681213 - 2¹⁰ = 206680189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206681219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1455431 + ... + 1455572.

It is an arithmetic number, because the mean of its divisors is an integer number (52398072).

Almost surely, 2^206681213 is an apocalyptic number.

It is an amenable number.

206681213 is a deficient number, since it is larger than the sum of its proper divisors (2911075).

206681213 is an equidigital number, since it uses as much as digits as its factorization.

206681213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2911074.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 206681213 is about 14376.4116872048. The cubic root of 206681213 is about 591.2443458883.

The spelling of 206681213 in words is "two hundred six million, six hundred eighty-one thousand, two hundred thirteen".