644201 has 2 divisors, whose sum is σ = 644202. Its totient is φ = 644200.

The previous prime is 644197. The next prime is 644227. The reversal of 644201 is 102446.

644201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 602176 + 42025 = 776^2 + 205^2 .

It is a cyclic number.

It is not a de Polignac number, because 644201 - 2² = 644197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 644201.

It is not a weakly prime, because it can be changed into another prime (644261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322100 + 322101.

It is an arithmetic number, because the mean of its divisors is an integer number (322101).

2⁶⁴⁴²⁰¹ is an apocalyptic number.

It is an amenable number.

644201 is a deficient number, since it is larger than the sum of its proper divisors (1).

644201 is an equidigital number, since it uses as much as digits as its factorization.

644201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 644201 is about 802.6213303919. The cubic root of 644201 is about 86.3655344500.

Adding to 644201 its reverse (102446), we get a palindrome (746647).

The spelling of 644201 in words is "six hundred forty-four thousand, two hundred one".