206064191 has 4 divisors (see below), whose sum is σ = 218185632. Its totient is φ = 193942752.

The previous prime is 206064163. The next prime is 206064197. The reversal of 206064191 is 191460602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 206064191 - 2¹⁰ = 206063167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206064197) 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 in 3 ways as a sum of consecutive naturals, for example, 6060695 + ... + 6060728.

It is an arithmetic number, because the mean of its divisors is an integer number (54546408).

Almost surely, 2^206064191 is an apocalyptic number.

206064191 is a deficient number, since it is larger than the sum of its proper divisors (12121441).

206064191 is a wasteful number, since it uses less digits than its factorization.

206064191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12121440.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 206064191 is about 14354.9361196767. The cubic root of 206064191 is about 590.6553963659.

The spelling of 206064191 in words is "two hundred six million, sixty-four thousand, one hundred ninety-one".