206113091 has 4 divisors (see below), whose sum is σ = 208936632. Its totient is φ = 203289552.

The previous prime is 206113087. The next prime is 206113093. The reversal of 206113091 is 190311602.

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 206113091 - 2² = 206113087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206113093) 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, 1411661 + ... + 1411806.

It is an arithmetic number, because the mean of its divisors is an integer number (52234158).

Almost surely, 2^206113091 is an apocalyptic number.

206113091 is a deficient number, since it is larger than the sum of its proper divisors (2823541).

206113091 is an equidigital number, since it uses as much as digits as its factorization.

206113091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2823540.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 206113091 is about 14356.6392655106. The cubic root of 206113091 is about 590.7021144368.

Adding to 206113091 its reverse (190311602), we get a palindrome (396424693).

The spelling of 206113091 in words is "two hundred six million, one hundred thirteen thousand, ninety-one".