206791 has 4 divisors (see below), whose sum is σ = 222712. Its totient is φ = 190872.

The previous prime is 206783. The next prime is 206803. The reversal of 206791 is 197602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 197602 = 2 ⋅98801.

It is a cyclic number.

It is not a de Polignac number, because 206791 - 2³ = 206783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7941 + ... + 7966.

It is an arithmetic number, because the mean of its divisors is an integer number (55678).

2²⁰⁶⁷⁹¹ is an apocalyptic number.

206791 is a deficient number, since it is larger than the sum of its proper divisors (15921).

206791 is a wasteful number, since it uses less digits than its factorization.

206791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15920.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 206791 is about 454.7427844397. The cubic root of 206791 is about 59.1349015058.

The spelling of 206791 in words is "two hundred six thousand, seven hundred ninety-one".