206642143 has 4 divisors (see below), whose sum is σ = 215626608. Its totient is φ = 197657680.

The previous prime is 206642113. The next prime is 206642153. The reversal of 206642143 is 341246602.

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 206642143 - 2¹³ = 206633951 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 (206642113) 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, 4492198 + ... + 4492243.

It is an arithmetic number, because the mean of its divisors is an integer number (53906652).

Almost surely, 2^206642143 is an apocalyptic number.

206642143 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

206642143 is a deficient number, since it is larger than the sum of its proper divisors (8984465).

206642143 is an equidigital number, since it uses as much as digits as its factorization.

206642143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8984464.

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

The square root of 206642143 is about 14375.0527999030. The cubic root of 206642143 is about 591.2070882327.

Adding to 206642143 its reverse (341246602), we get a palindrome (547888745).

The spelling of 206642143 in words is "two hundred six million, six hundred forty-two thousand, one hundred forty-three".