206643147 has 4 divisors (see below), whose sum is σ = 275524200. Its totient is φ = 137762096.

The previous prime is 206643139. The next prime is 206643167. The reversal of 206643147 is 741346602.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 206643147 - 2³ = 206643139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206643127) 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, 34440522 + ... + 34440527.

It is an arithmetic number, because the mean of its divisors is an integer number (68881050).

Almost surely, 2^206643147 is an apocalyptic number.

206643147 is a deficient number, since it is larger than the sum of its proper divisors (68881053).

206643147 is an equidigital number, since it uses as much as digits as its factorization.

206643147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68881052.

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 206643147 is about 14375.0877214715. The cubic root of 206643147 is about 591.2080457189.

Adding to 206643147 its reverse (741346602), we get a palindrome (947989749).

The spelling of 206643147 in words is "two hundred six million, six hundred forty-three thousand, one hundred forty-seven".