206142869 has 2 divisors, whose sum is σ = 206142870. Its totient is φ = 206142868.

The previous prime is 206142857. The next prime is 206142889. The reversal of 206142869 is 968241602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136002244 + 70140625 = 11662^2 + 8375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206142869 is a prime.

It is a super-2 number, since 2×206142869² = 84989764879102322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206142889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103071434 + 103071435.

It is an arithmetic number, because the mean of its divisors is an integer number (103071435).

Almost surely, 2^206142869 is an apocalyptic number.

It is an amenable number.

206142869 is a deficient number, since it is larger than the sum of its proper divisors (1).

206142869 is an equidigital number, since it uses as much as digits as its factorization.

206142869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 206142869 is about 14357.6763092083. The cubic root of 206142869 is about 590.7305601159.

The spelling of 206142869 in words is "two hundred six million, one hundred forty-two thousand, eight hundred sixty-nine".