205323143 has 2 divisors, whose sum is σ = 205323144. Its totient is φ = 205323142.

The previous prime is 205323109. The next prime is 205323149. The reversal of 205323143 is 341323502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205323143 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205323149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102661571 + 102661572.

It is an arithmetic number, because the mean of its divisors is an integer number (102661572).

Almost surely, 2^205323143 is an apocalyptic number.

205323143 is a deficient number, since it is larger than the sum of its proper divisors (1).

205323143 is an equidigital number, since it uses as much as digits as its factorization.

205323143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 205323143 is about 14329.1012628148. The cubic root of 205323143 is about 589.9465076467.

Adding to 205323143 its reverse (341323502), we get a palindrome (546646645).

The spelling of 205323143 in words is "two hundred five million, three hundred twenty-three thousand, one hundred forty-three".