206864087 has 2 divisors, whose sum is σ = 206864088. Its totient is φ = 206864086.

The previous prime is 206864081. The next prime is 206864101. The reversal of 206864087 is 780468602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 206864087 - 2¹⁸ = 206601943 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206864081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103432043 + 103432044.

It is an arithmetic number, because the mean of its divisors is an integer number (103432044).

Almost surely, 2^206864087 is an apocalyptic number.

206864087 is a deficient number, since it is larger than the sum of its proper divisors (1).

206864087 is an equidigital number, since it uses as much as digits as its factorization.

206864087 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 41.

The square root of 206864087 is about 14382.7704911119. The cubic root of 206864087 is about 591.4186744965.

The spelling of 206864087 in words is "two hundred six million, eight hundred sixty-four thousand, eighty-seven".