643622113 has 2 divisors, whose sum is σ = 643622114. Its totient is φ = 643622112.

The previous prime is 643622099. The next prime is 643622137. The reversal of 643622113 is 311226346.

643622113 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 582594769 + 61027344 = 24137^2 + 7812^2 .

It is a cyclic number.

It is not a de Polignac number, because 643622113 - 2⁵ = 643622081 is a prime.

It is not a weakly prime, because it can be changed into another prime (644622113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321811056 + 321811057.

It is an arithmetic number, because the mean of its divisors is an integer number (321811057).

Almost surely, 2^643622113 is an apocalyptic number.

It is an amenable number.

643622113 is a deficient number, since it is larger than the sum of its proper divisors (1).

643622113 is an equidigital number, since it uses as much as digits as its factorization.

643622113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 28.

The square root of 643622113 is about 25369.7085714440. The cubic root of 643622113 is about 863.3965698410.

Adding to 643622113 its reverse (311226346), we get a palindrome (954848459).

The spelling of 643622113 in words is "six hundred forty-three million, six hundred twenty-two thousand, one hundred thirteen".