643009463 has 2 divisors, whose sum is σ = 643009464. Its totient is φ = 643009462.

The previous prime is 643009453. The next prime is 643009529. The reversal of 643009463 is 364900346.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643009463 - 2⁴ = 643009447 is a prime.

It is a super-3 number, since 3×643009463³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643009403) 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, 321504731 + 321504732.

It is an arithmetic number, because the mean of its divisors is an integer number (321504732).

Almost surely, 2^643009463 is an apocalyptic number.

643009463 is a deficient number, since it is larger than the sum of its proper divisors (1).

643009463 is an equidigital number, since it uses as much as digits as its factorization.

643009463 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 35.

The square root of 643009463 is about 25357.6312576707. The cubic root of 643009463 is about 863.1225333519.

The spelling of 643009463 in words is "six hundred forty-three million, nine thousand, four hundred sixty-three".