206142247 has 4 divisors (see below), whose sum is σ = 206792856. Its totient is φ = 205491640.

The previous prime is 206142239. The next prime is 206142253. The reversal of 206142247 is 742241602.

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 206142247 - 2³ = 206142239 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 (206142257) 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, 324829 + ... + 325462.

It is an arithmetic number, because the mean of its divisors is an integer number (51698214).

Almost surely, 2^206142247 is an apocalyptic number.

206142247 is a deficient number, since it is larger than the sum of its proper divisors (650609).

206142247 is an equidigital number, since it uses as much as digits as its factorization.

206142247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650608.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 206142247 is about 14357.6546483052. The cubic root of 206142247 is about 590.7299659733.

Adding to 206142247 its reverse (742241602), we get a palindrome (948383849).

The spelling of 206142247 in words is "two hundred six million, one hundred forty-two thousand, two hundred forty-seven".