643133 has 8 divisors (see below), whose sum is σ = 677280. Its totient is φ = 609840.

The previous prime is 643129. The next prime is 643183. The reversal of 643133 is 331346.

643133 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 643133 - 2² = 643129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1778 + ... + 2108.

It is an arithmetic number, because the mean of its divisors is an integer number (84660).

2⁶⁴³¹³³ is an apocalyptic number.

It is an amenable number.

643133 is a deficient number, since it is larger than the sum of its proper divisors (34147).

643133 is a wasteful number, since it uses less digits than its factorization.

643133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427.

The product of its digits is 648, while the sum is 20.

The square root of 643133 is about 801.9557344393. The cubic root of 643133 is about 86.3177805084.

Adding to 643133 its reverse (331346), we get a palindrome (974479).

The spelling of 643133 in words is "six hundred forty-three thousand, one hundred thirty-three".