643404113 has 16 divisors (see below), whose sum is σ = 707616000. Its totient is φ = 580170000.

The previous prime is 643404079. The next prime is 643404119. The reversal of 643404113 is 311404346.

It is a cyclic number.

It is not a de Polignac number, because 643404113 - 2²⁰ = 642355537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643404119) 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 in 15 ways as a sum of consecutive naturals, for example, 1289138 + ... + 1289636.

It is an arithmetic number, because the mean of its divisors is an integer number (44226000).

Almost surely, 2^643404113 is an apocalyptic number.

It is an amenable number.

643404113 is a deficient number, since it is larger than the sum of its proper divisors (64211887).

643404113 is a wasteful number, since it uses less digits than its factorization.

643404113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1228.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 643404113 is about 25365.4117451304. The cubic root of 643404113 is about 863.2990790396.

Adding to 643404113 its reverse (311404346), we get a palindrome (954808459).

The spelling of 643404113 in words is "six hundred forty-three million, four hundred four thousand, one hundred thirteen".