206226857 has 2 divisors, whose sum is σ = 206226858. Its totient is φ = 206226856.

The previous prime is 206226829. The next prime is 206226887. The reversal of 206226857 is 758622602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196672576 + 9554281 = 14024^2 + 3091^2 .

It is a cyclic number.

It is not a de Polignac number, because 206226857 - 2²² = 202032553 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206226857.

It is not a weakly prime, because it can be changed into another prime (206226887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103113428 + 103113429.

It is an arithmetic number, because the mean of its divisors is an integer number (103113429).

Almost surely, 2^206226857 is an apocalyptic number.

It is an amenable number.

206226857 is a deficient number, since it is larger than the sum of its proper divisors (1).

206226857 is an equidigital number, since it uses as much as digits as its factorization.

206226857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 206226857 is about 14360.6008579028. The cubic root of 206226857 is about 590.8107755866.

The spelling of 206226857 in words is "two hundred six million, two hundred twenty-six thousand, eight hundred fifty-seven".