206390087 has 2 divisors, whose sum is σ = 206390088. Its totient is φ = 206390086.

The previous prime is 206390069. The next prime is 206390099. The reversal of 206390087 is 780093602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206390087 - 2¹⁰ = 206389063 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 (206390687) 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, 103195043 + 103195044.

It is an arithmetic number, because the mean of its divisors is an integer number (103195044).

Almost surely, 2^206390087 is an apocalyptic number.

206390087 is a deficient number, since it is larger than the sum of its proper divisors (1).

206390087 is an equidigital number, since it uses as much as digits as its factorization.

206390087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 206390087 is about 14366.2829917832. The cubic root of 206390087 is about 590.9666114327.

The spelling of 206390087 in words is "two hundred six million, three hundred ninety thousand, eighty-seven".