206218091 has 2 divisors, whose sum is σ = 206218092. Its totient is φ = 206218090.

The previous prime is 206218079. The next prime is 206218097. The reversal of 206218091 is 190812602.

206218091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206218091 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (206218097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103109045 + 103109046.

It is an arithmetic number, because the mean of its divisors is an integer number (103109046).

Almost surely, 2^206218091 is an apocalyptic number.

206218091 is a deficient number, since it is larger than the sum of its proper divisors (1).

206218091 is an equidigital number, since it uses as much as digits as its factorization.

206218091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 206218091 is about 14360.2956445889. The cubic root of 206218091 is about 590.8024043513.

The spelling of 206218091 in words is "two hundred six million, two hundred eighteen thousand, ninety-one".