643201583 has 4 divisors (see below), whose sum is σ = 644332560. Its totient is φ = 642070608.

The previous prime is 643201577. The next prime is 643201591. The reversal of 643201583 is 385102346.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 643201583 - 2¹⁶ = 643136047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643201513) 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 in 3 ways as a sum of consecutive naturals, for example, 564635 + ... + 565772.

It is an arithmetic number, because the mean of its divisors is an integer number (161083140).

Almost surely, 2^643201583 is an apocalyptic number.

643201583 is a deficient number, since it is larger than the sum of its proper divisors (1130977).

643201583 is a wasteful number, since it uses less digits than its factorization.

643201583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130976.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 643201583 is about 25361.4191834763. The cubic root of 643201583 is about 863.2084867727.

The spelling of 643201583 in words is "six hundred forty-three million, two hundred one thousand, five hundred eighty-three".