643543193 has 2 divisors, whose sum is σ = 643543194. Its totient is φ = 643543192.

The previous prime is 643543181. The next prime is 643543207. The reversal of 643543193 is 391345346.

643543193 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., 563207824 + 80335369 = 23732^2 + 8963^2 .

It is a cyclic number.

It is not a de Polignac number, because 643543193 - 2²⁶ = 576434329 is a prime.

It is not a weakly prime, because it can be changed into another prime (643543123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321771596 + 321771597.

It is an arithmetic number, because the mean of its divisors is an integer number (321771597).

Almost surely, 2^643543193 is an apocalyptic number.

It is an amenable number.

643543193 is a deficient number, since it is larger than the sum of its proper divisors (1).

643543193 is an equidigital number, since it uses as much as digits as its factorization.

643543193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 38.

The square root of 643543193 is about 25368.1531255233. The cubic root of 643543193 is about 863.3612789246.

The spelling of 643543193 in words is "six hundred forty-three million, five hundred forty-three thousand, one hundred ninety-three".