206722189 has 2 divisors, whose sum is σ = 206722190. Its totient is φ = 206722188.

The previous prime is 206722163. The next prime is 206722211. The reversal of 206722189 is 981227602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206152164 + 570025 = 14358^2 + 755^2 .

It is a cyclic number.

It is not a de Polignac number, because 206722189 - 2¹¹ = 206720141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206722129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103361094 + 103361095.

It is an arithmetic number, because the mean of its divisors is an integer number (103361095).

Almost surely, 2^206722189 is an apocalyptic number.

It is an amenable number.

206722189 is a deficient number, since it is larger than the sum of its proper divisors (1).

206722189 is an equidigital number, since it uses as much as digits as its factorization.

206722189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 206722189 is about 14377.8367287989. The cubic root of 206722189 is about 591.2834160858.

The spelling of 206722189 in words is "two hundred six million, seven hundred twenty-two thousand, one hundred eighty-nine".