646001 has 4 divisors (see below), whose sum is σ = 674112. Its totient is φ = 617892.

The previous prime is 645979. The next prime is 646003. The reversal of 646001 is 100646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 646001 - 2⁶ = 645937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646003) 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, 14021 + ... + 14066.

It is an arithmetic number, because the mean of its divisors is an integer number (168528).

2⁶⁴⁶⁰⁰¹ is an apocalyptic number.

It is an amenable number.

646001 is a deficient number, since it is larger than the sum of its proper divisors (28111).

646001 is a wasteful number, since it uses less digits than its factorization.

646001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28110.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 646001 is about 803.7418739869. The cubic root of 646001 is about 86.4458993232.

Adding to 646001 its reverse (100646), we get a palindrome (746647).

The spelling of 646001 in words is "six hundred forty-six thousand, one".