206321189 has 2 divisors, whose sum is σ = 206321190. Its totient is φ = 206321188.

The previous prime is 206321177. The next prime is 206321191. The reversal of 206321189 is 981123602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160528900 + 45792289 = 12670^2 + 6767^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206321189 is a prime.

Together with 206321191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206321989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103160594 + 103160595.

It is an arithmetic number, because the mean of its divisors is an integer number (103160595).

Almost surely, 2^206321189 is an apocalyptic number.

It is an amenable number.

206321189 is a deficient number, since it is larger than the sum of its proper divisors (1).

206321189 is an equidigital number, since it uses as much as digits as its factorization.

206321189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 206321189 is about 14363.8848853644. The cubic root of 206321189 is about 590.9008444673.

The spelling of 206321189 in words is "two hundred six million, three hundred twenty-one thousand, one hundred eighty-nine".