643734113 has 4 divisors (see below), whose sum is σ = 702255408. Its totient is φ = 585212820.

The previous prime is 643734109. The next prime is 643734173. The reversal of 643734113 is 311437346.

643734113 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 643734113 - 2² = 643734109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 643734113.

It is not an unprimeable number, because it can be changed into a prime (643734173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29260631 + ... + 29260652.

It is an arithmetic number, because the mean of its divisors is an integer number (175563852).

Almost surely, 2^643734113 is an apocalyptic number.

It is an amenable number.

643734113 is a deficient number, since it is larger than the sum of its proper divisors (58521295).

643734113 is a wasteful number, since it uses less digits than its factorization.

643734113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58521294.

The product of its digits is 18144, while the sum is 32.

The square root of 643734113 is about 25371.9158322741. The cubic root of 643734113 is about 863.4466482982.

It can be divided in two parts, 64373 and 4113, that added together give a palindrome (68486).

The spelling of 643734113 in words is "six hundred forty-three million, seven hundred thirty-four thousand, one hundred thirteen".