206645213 has 8 divisors (see below), whose sum is σ = 215011800. Its totient is φ = 198361408.

The previous prime is 206645203. The next prime is 206645239. The reversal of 206645213 is 312546602.

It can be written as a sum of positive squares in 4 ways, for example, as 13935289 + 192709924 = 3733^2 + 13882^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 206645213 - 2¹⁰ = 206644189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206645203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15578 + ... + 25611.

It is an arithmetic number, because the mean of its divisors is an integer number (26876475).

Almost surely, 2^206645213 is an apocalyptic number.

It is an amenable number.

206645213 is a deficient number, since it is larger than the sum of its proper divisors (8366587).

206645213 is a wasteful number, since it uses less digits than its factorization.

206645213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41391.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 206645213 is about 14375.1595817229. The cubic root of 206645213 is about 591.2100159943.

The spelling of 206645213 in words is "two hundred six million, six hundred forty-five thousand, two hundred thirteen".