206819 has 2 divisors, whose sum is σ = 206820. Its totient is φ = 206818.

The previous prime is 206813. The next prime is 206821. The reversal of 206819 is 918602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206819 - 2⁴ = 206803 is a prime.

It is a super-2 number, since 2×206819² = 85548197522, which contains 22 as substring.

Together with 206821, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (206813) 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, 103409 + 103410.

It is an arithmetic number, because the mean of its divisors is an integer number (103410).

2²⁰⁶⁸¹⁹ is an apocalyptic number.

206819 is a deficient number, since it is larger than the sum of its proper divisors (1).

206819 is an equidigital number, since it uses as much as digits as its factorization.

206819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 206819 is about 454.7735700324. The cubic root of 206819 is about 59.1375703881.

The spelling of 206819 in words is "two hundred six thousand, eight hundred nineteen".