206105223 has 4 divisors (see below), whose sum is σ = 274806968. Its totient is φ = 137403480.

The previous prime is 206105209. The next prime is 206105257. The reversal of 206105223 is 322501602.

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

It is not a de Polignac number, because 206105223 - 2⁸ = 206104967 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 206105223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206105023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34350868 + ... + 34350873.

It is an arithmetic number, because the mean of its divisors is an integer number (68701742).

Almost surely, 2^206105223 is an apocalyptic number.

206105223 is a deficient number, since it is larger than the sum of its proper divisors (68701745).

206105223 is an equidigital number, since it uses as much as digits as its factorization.

206105223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68701744.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 206105223 is about 14356.3652433337. The cubic root of 206105223 is about 590.6945980076.

Adding to 206105223 its reverse (322501602), we get a palindrome (528606825).

The spelling of 206105223 in words is "two hundred six million, one hundred five thousand, two hundred twenty-three".