640201 has 4 divisors (see below), whose sum is σ = 645012. Its totient is φ = 635392.

The previous prime is 640193. The next prime is 640219. The reversal of 640201 is 102046.

640201 is nontrivially palindromic in base 16.

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

It can be written as a sum of positive squares in 2 ways, for example, as 518400 + 121801 = 720^2 + 349^2 .

It is a cyclic number.

It is not a de Polignac number, because 640201 - 2³ = 640193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640231) 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, 2200 + ... + 2473.

It is an arithmetic number, because the mean of its divisors is an integer number (161253).

2⁶⁴⁰²⁰¹ is an apocalyptic number.

It is an amenable number.

640201 is a deficient number, since it is larger than the sum of its proper divisors (4811).

640201 is a wasteful number, since it uses less digits than its factorization.

640201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4810.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 640201 is about 800.1256151380. The cubic root of 640201 is about 86.1864083522.

Adding to 640201 its reverse (102046), we get a palindrome (742247).

It can be divided in two parts, 640 and 201, that added together give a square (841 = 29²).

The spelling of 640201 in words is "six hundred forty thousand, two hundred one".