206142857 has 2 divisors, whose sum is σ = 206142858. Its totient is φ = 206142856.

The previous prime is 206142847. The next prime is 206142869. The reversal of 206142857 is 758241602.

206142857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146991376 + 59151481 = 12124^2 + 7691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206142857 is a prime.

206142857 is a modest number, since divided by 142857 gives 206 as remainder.

It is not a weakly prime, because it can be changed into another prime (206142847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103071428 + 103071429.

It is an arithmetic number, because the mean of its divisors is an integer number (103071429).

Almost surely, 2^206142857 is an apocalyptic number.

It is an amenable number.

206142857 is a deficient number, since it is larger than the sum of its proper divisors (1).

206142857 is an equidigital number, since it uses as much as digits as its factorization.

206142857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 206142857 is about 14357.6758913133. The cubic root of 206142857 is about 590.7305486534.

The spelling of 206142857 in words is "two hundred six million, one hundred forty-two thousand, eight hundred fifty-seven".