206113111 has 4 divisors (see below), whose sum is σ = 206170000. Its totient is φ = 206056224.

The previous prime is 206113093. The next prime is 206113123. The reversal of 206113111 is 111311602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111311602 = 2 ⋅55655801.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206113111 is a prime.

It is a super-2 number, since 2×206113111² = 84965229052196642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206113181) 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, 22611 + ... + 30388.

It is an arithmetic number, because the mean of its divisors is an integer number (51542500).

Almost surely, 2^206113111 is an apocalyptic number.

206113111 is a deficient number, since it is larger than the sum of its proper divisors (56889).

206113111 is an equidigital number, since it uses as much as digits as its factorization.

206113111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56888.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 206113111 is about 14356.6399620524. The cubic root of 206113111 is about 590.7021335429.

Adding to 206113111 its reverse (111311602), we get a palindrome (317424713).

The spelling of 206113111 in words is "two hundred six million, one hundred thirteen thousand, one hundred eleven".