206055191 has 4 divisors (see below), whose sum is σ = 210439392. Its totient is φ = 201670992.

The previous prime is 206055173. The next prime is 206055253. The reversal of 206055191 is 191550602.

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 206055191 - 2⁶ = 206055127 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 (206055491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2192030 + ... + 2192123.

It is an arithmetic number, because the mean of its divisors is an integer number (52609848).

Almost surely, 2^206055191 is an apocalyptic number.

206055191 is a deficient number, since it is larger than the sum of its proper divisors (4384201).

206055191 is an equidigital number, since it uses as much as digits as its factorization.

206055191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4384200.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 206055191 is about 14354.6226352350. The cubic root of 206055191 is about 590.6467971426.

The spelling of 206055191 in words is "two hundred six million, fifty-five thousand, one hundred ninety-one".