643001 has 8 divisors (see below), whose sum is σ = 666624. Its totient is φ = 619920.

The previous prime is 642997. The next prime is 643009. The reversal of 643001 is 100346.

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 643001 - 2² = 642997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5000 + ... + 5126.

It is an arithmetic number, because the mean of its divisors is an integer number (83328).

2⁶⁴³⁰⁰¹ is an apocalyptic number.

643001 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

643001 is a deficient number, since it is larger than the sum of its proper divisors (23623).

643001 is a wasteful number, since it uses less digits than its factorization.

643001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 643001 is about 801.8734314092. The cubic root of 643001 is about 86.3118746659.

Adding to 643001 its reverse (100346), we get a palindrome (743347).

The spelling of 643001 in words is "six hundred forty-three thousand, one".