643143 has 4 divisors (see below), whose sum is σ = 857528. Its totient is φ = 428760.

The previous prime is 643129. The next prime is 643183. The reversal of 643143 is 341346.

643143 is digitally balanced in base 7, 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.

It is a de Polignac number, because none of the positive numbers 2^k-643143 is a prime.

It is a D-number.

It is a Duffinian number.

643143 is strictly pandigital in base 7.

It is a nialpdrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 643143.

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 3 ways as a sum of consecutive naturals, for example, 107188 + ... + 107193.

It is an arithmetic number, because the mean of its divisors is an integer number (214382).

2⁶⁴³¹⁴³ is an apocalyptic number.

643143 is a deficient number, since it is larger than the sum of its proper divisors (214385).

643143 is a wasteful number, since it uses less digits than its factorization.

643143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214384.

The product of its digits is 864, while the sum is 21.

The square root of 643143 is about 801.9619691731. The cubic root of 643143 is about 86.3182278878.

Adding to 643143 its reverse (341346), we get a palindrome (984489).

The spelling of 643143 in words is "six hundred forty-three thousand, one hundred forty-three".