206779 has 2 divisors, whose sum is σ = 206780. Its totient is φ = 206778.

The previous prime is 206749. The next prime is 206783. The reversal of 206779 is 977602.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206779 - 2⁷ = 206651 is a prime.

It is a Chen prime.

206779 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 206779.

It is not a weakly prime, because it can be changed into another prime (206749) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103389 + 103390.

It is an arithmetic number, because the mean of its divisors is an integer number (103390).

2²⁰⁶⁷⁷⁹ is an apocalyptic number.

206779 is a deficient number, since it is larger than the sum of its proper divisors (1).

206779 is an equidigital number, since it uses as much as digits as its factorization.

206779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 206779 is about 454.7295899763. The cubic root of 206779 is about 59.1337576254.

The spelling of 206779 in words is "two hundred six thousand, seven hundred seventy-nine".