3641221 has 2 divisors, whose sum is σ = 3641222. Its totient is φ = 3641220.

The previous prime is 3641219. The next prime is 3641233. The reversal of 3641221 is 1221463.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3568321 + 72900 = 1889^2 + 270^2 .

It is an emirp because it is prime and its reverse (1221463) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3641221 - 2¹ = 3641219 is a prime.

Together with 3641219, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3641201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1820610 + 1820611.

It is an arithmetic number, because the mean of its divisors is an integer number (1820611).

Almost surely, 2^3641221 is an apocalyptic number.

It is an amenable number.

3641221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3641221 is an equidigital number, since it uses as much as digits as its factorization.

3641221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 19.

The square root of 3641221 is about 1908.1983649506. The cubic root of 3641221 is about 153.8446316324.

Adding to 3641221 its reverse (1221463), we get a palindrome (4862684).

It can be divided in two parts, 364 and 1221, that multiplied together give a palindrome (444444).

The spelling of 3641221 in words is "three million, six hundred forty-one thousand, two hundred twenty-one".