644341 has 2 divisors, whose sum is σ = 644342. Its totient is φ = 644340.

The previous prime is 644327. The next prime is 644353. The reversal of 644341 is 143446.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 422500 + 221841 = 650^2 + 471^2 .

It is a cyclic number.

It is not a de Polignac number, because 644341 - 2¹³ = 636149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (644381) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322170 + 322171.

It is an arithmetic number, because the mean of its divisors is an integer number (322171).

2⁶⁴⁴³⁴¹ is an apocalyptic number.

It is an amenable number.

644341 is a deficient number, since it is larger than the sum of its proper divisors (1).

644341 is an equidigital number, since it uses as much as digits as its factorization.

644341 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 22.

The square root of 644341 is about 802.7085398823. The cubic root of 644341 is about 86.3717904162.

Adding to 644341 its reverse (143446), we get a palindrome (787787).

The spelling of 644341 in words is "six hundred forty-four thousand, three hundred forty-one".