205442143 has 2 divisors, whose sum is σ = 205442144. Its totient is φ = 205442142.

The previous prime is 205442099. The next prime is 205442147. The reversal of 205442143 is 341244502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205442143 - 2¹³ = 205433951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205442147) 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, 102721071 + 102721072.

It is an arithmetic number, because the mean of its divisors is an integer number (102721072).

Almost surely, 2^205442143 is an apocalyptic number.

205442143 is a deficient number, since it is larger than the sum of its proper divisors (1).

205442143 is an equidigital number, since it uses as much as digits as its factorization.

205442143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 205442143 is about 14333.2530501628. The cubic root of 205442143 is about 590.0604582305.

Adding to 205442143 its reverse (341244502), we get a palindrome (546686645).

The spelling of 205442143 in words is "two hundred five million, four hundred forty-two thousand, one hundred forty-three".