206818873 has 2 divisors, whose sum is σ = 206818874. Its totient is φ = 206818872.

The previous prime is 206818849. The next prime is 206818877. The reversal of 206818873 is 378818602.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181387024 + 25431849 = 13468^2 + 5043^2 .

It is a cyclic number.

It is not a de Polignac number, because 206818873 - 2²¹ = 204721721 is a prime.

It is not a weakly prime, because it can be changed into another prime (206818877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103409436 + 103409437.

It is an arithmetic number, because the mean of its divisors is an integer number (103409437).

Almost surely, 2^206818873 is an apocalyptic number.

It is an amenable number.

206818873 is a deficient number, since it is larger than the sum of its proper divisors (1).

206818873 is an equidigital number, since it uses as much as digits as its factorization.

206818873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 206818873 is about 14381.1985939977. The cubic root of 206818873 is about 591.3755828338.

The spelling of 206818873 in words is "two hundred six million, eight hundred eighteen thousand, eight hundred seventy-three".