206145491 has 2 divisors, whose sum is σ = 206145492. Its totient is φ = 206145490.

The previous prime is 206145473. The next prime is 206145521. The reversal of 206145491 is 194541602.

206145491 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 is a cyclic number.

It is not a de Polignac number, because 206145491 - 2¹⁴ = 206129107 is a prime.

It is not a weakly prime, because it can be changed into another prime (206145391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103072745 + 103072746.

It is an arithmetic number, because the mean of its divisors is an integer number (103072746).

Almost surely, 2^206145491 is an apocalyptic number.

206145491 is a deficient number, since it is larger than the sum of its proper divisors (1).

206145491 is an equidigital number, since it uses as much as digits as its factorization.

206145491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 206145491 is about 14357.7676189580. The cubic root of 206145491 is about 590.7330646718.

The spelling of 206145491 in words is "two hundred six million, one hundred forty-five thousand, four hundred ninety-one".