206671 has 4 divisors (see below), whose sum is σ = 207792. Its totient is φ = 205552.

The previous prime is 206651. The next prime is 206699. The reversal of 206671 is 176602.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 176602 = 2 ⋅88301.

It is a cyclic number.

It is not a de Polignac number, because 206671 - 2⁵ = 206639 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206641) 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, 211 + ... + 676.

It is an arithmetic number, because the mean of its divisors is an integer number (51948).

2²⁰⁶⁶⁷¹ is an apocalyptic number.

206671 is a deficient number, since it is larger than the sum of its proper divisors (1121).

206671 is an equidigital number, since it uses as much as digits as its factorization.

206671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 206671 is about 454.6108225725. The cubic root of 206671 is about 59.1234607093.

The spelling of 206671 in words is "two hundred six thousand, six hundred seventy-one".