205030643 has 2 divisors, whose sum is σ = 205030644. Its totient is φ = 205030642.

The previous prime is 205030607. The next prime is 205030663. The reversal of 205030643 is 346030502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205030643 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (205030663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102515321 + 102515322.

It is an arithmetic number, because the mean of its divisors is an integer number (102515322).

Almost surely, 2^205030643 is an apocalyptic number.

205030643 is a deficient number, since it is larger than the sum of its proper divisors (1).

205030643 is an equidigital number, since it uses as much as digits as its factorization.

205030643 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 205030643 is about 14318.8911232679. The cubic root of 205030643 is about 589.6662317888. Note that the first 3 decimals are identical.

The spelling of 205030643 in words is "two hundred five million, thirty thousand, six hundred forty-three".