206091 has 16 divisors (see below), whose sum is σ = 324000. Its totient is φ = 129024.

The previous prime is 206083. The next prime is 206123. The reversal of 206091 is 190602.

It is not a de Polignac number, because 206091 - 2³ = 206083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 235 + ... + 683.

It is an arithmetic number, because the mean of its divisors is an integer number (20250).

2²⁰⁶⁰⁹¹ is an apocalyptic number.

206091 is a deficient number, since it is larger than the sum of its proper divisors (117909).

206091 is a wasteful number, since it uses less digits than its factorization.

206091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475 (or 469 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 206091 is about 453.9724661254. The cubic root of 206091 is about 59.0681010057.

Adding to 206091 its reverse (190602), we get a palindrome (396693).

The spelling of 206091 in words is "two hundred six thousand, ninety-one".