206111243 has 8 divisors (see below), whose sum is σ = 222238128. Its totient is φ = 190023264.

The previous prime is 206111239. The next prime is 206111267. The reversal of 206111243 is 342111602.

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 206111243 - 2² = 206111239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206111203) 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, 1796 + ... + 20382.

It is an arithmetic number, because the mean of its divisors is an integer number (27779766).

Almost surely, 2^206111243 is an apocalyptic number.

206111243 is a deficient number, since it is larger than the sum of its proper divisors (16126885).

206111243 is a wasteful number, since it uses less digits than its factorization.

206111243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19453.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 206111243 is about 14356.5749048998. The cubic root of 206111243 is about 590.7003490294.

Adding to 206111243 its reverse (342111602), we get a palindrome (548222845).

The spelling of 206111243 in words is "two hundred six million, one hundred eleven thousand, two hundred forty-three".