643201 has 4 divisors (see below), whose sum is σ = 692692. Its totient is φ = 593712.

The previous prime is 643199. The next prime is 643213. The reversal of 643201 is 102346.

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 119025 + 524176 = 345^2 + 724^2 .

It is a cyclic number.

It is not a de Polignac number, because 643201 - 2¹ = 643199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24726 + ... + 24751.

It is an arithmetic number, because the mean of its divisors is an integer number (173173).

2⁶⁴³²⁰¹ is an apocalyptic number.

It is an amenable number.

643201 is a deficient number, since it is larger than the sum of its proper divisors (49491).

643201 is a wasteful number, since it uses less digits than its factorization.

643201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49490.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 643201 is about 801.9981296736. The cubic root of 643201 is about 86.3208225968.

Adding to 643201 its reverse (102346), we get a palindrome (745547).

The spelling of 643201 in words is "six hundred forty-three thousand, two hundred one".