206641 has 2 divisors, whose sum is σ = 206642. Its totient is φ = 206640.

The previous prime is 206639. The next prime is 206651. The reversal of 206641 is 146602.

206641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119025 + 87616 = 345^2 + 296^2 .

It is a cyclic number.

It is not a de Polignac number, because 206641 - 2¹ = 206639 is a prime.

Together with 206639, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 14.

It is not a weakly prime, because it can be changed into another prime (206651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103320 + 103321.

It is an arithmetic number, because the mean of its divisors is an integer number (103321).

2²⁰⁶⁶⁴¹ is an apocalyptic number.

206641 is the 288-th centered pentagonal number.

It is an amenable number.

206641 is a deficient number, since it is larger than the sum of its proper divisors (1).

206641 is an equidigital number, since it uses as much as digits as its factorization.

206641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 206641 is about 454.5778261200. The cubic root of 206641 is about 59.1205998183.

The spelling of 206641 in words is "two hundred six thousand, six hundred forty-one".