206651 has 2 divisors, whose sum is σ = 206652. Its totient is φ = 206650.

The previous prime is 206641. The next prime is 206699. The reversal of 206651 is 156602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 206651 - 2¹⁰ = 205627 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another 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 as a sum of consecutive naturals, namely, 103325 + 103326.

It is an arithmetic number, because the mean of its divisors is an integer number (103326).

2²⁰⁶⁶⁵¹ is an apocalyptic number.

206651 is a deficient number, since it is larger than the sum of its proper divisors (1).

206651 is an equidigital number, since it uses as much as digits as its factorization.

206651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 206651 is about 454.5888252036. The cubic root of 206651 is about 59.1215534794.

The spelling of 206651 in words is "two hundred six thousand, six hundred fifty-one".