643432003 has 2 divisors, whose sum is σ = 643432004. Its totient is φ = 643432002.

The previous prime is 643431977. The next prime is 643432007. The reversal of 643432003 is 300234346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643432003 - 2¹³ = 643423811 is a prime.

It is not a weakly prime, because it can be changed into another prime (643432007) 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, 321716001 + 321716002.

It is an arithmetic number, because the mean of its divisors is an integer number (321716002).

Almost surely, 2^643432003 is an apocalyptic number.

643432003 is a deficient number, since it is larger than the sum of its proper divisors (1).

643432003 is an equidigital number, since it uses as much as digits as its factorization.

643432003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 25.

The square root of 643432003 is about 25365.9615035583. The cubic root of 643432003 is about 863.3115528296.

Adding to 643432003 its reverse (300234346), we get a palindrome (943666349).

The spelling of 643432003 in words is "six hundred forty-three million, four hundred thirty-two thousand, three".