641441 has 2 divisors, whose sum is σ = 641442. Its totient is φ = 641440.

The previous prime is 641437. The next prime is 641453. The reversal of 641441 is 144146.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 355216 + 286225 = 596^2 + 535^2 .

It is a cyclic number.

It is not a de Polignac number, because 641441 - 2² = 641437 is a prime.

It is a super-2 number, since 2×641441² = 822893112962, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (641411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320720 + 320721.

It is an arithmetic number, because the mean of its divisors is an integer number (320721).

2⁶⁴¹⁴⁴¹ is an apocalyptic number.

It is an amenable number.

641441 is a deficient number, since it is larger than the sum of its proper divisors (1).

641441 is an equidigital number, since it uses as much as digits as its factorization.

641441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 20.

The square root of 641441 is about 800.9001186165. The cubic root of 641441 is about 86.2420170445.

Adding to 641441 its reverse (144146), we get a palindrome (785587).

The spelling of 641441 in words is "six hundred forty-one thousand, four hundred forty-one".