643246003 has 2 divisors, whose sum is σ = 643246004. Its totient is φ = 643246002.

The previous prime is 643245989. The next prime is 643246027. The reversal of 643246003 is 300642346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643246003 - 2⁵ = 643245971 is a prime.

It is equal to p_33460543 and since 643246003 and 33460543 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (643246603) 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, 321623001 + 321623002.

It is an arithmetic number, because the mean of its divisors is an integer number (321623002).

Almost surely, 2^643246003 is an apocalyptic number.

643246003 is a deficient number, since it is larger than the sum of its proper divisors (1).

643246003 is an equidigital number, since it uses as much as digits as its factorization.

643246003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 28.

The square root of 643246003 is about 25362.2949079928. The cubic root of 643246003 is about 863.2283575977.

Adding to 643246003 its reverse (300642346), we get a palindrome (943888349).

The spelling of 643246003 in words is "six hundred forty-three million, two hundred forty-six thousand, three".