3605221 has 2 divisors, whose sum is σ = 3605222. Its totient is φ = 3605220.

The previous prime is 3605201. The next prime is 3605233. The reversal of 3605221 is 1225063.

It is a happy number.

3605221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3101121 + 504100 = 1761^2 + 710^2 .

It is a cyclic number.

It is not a de Polignac number, because 3605221 - 2⁷ = 3605093 is a prime.

3605221 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3605201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1802610 + 1802611.

It is an arithmetic number, because the mean of its divisors is an integer number (1802611).

Almost surely, 2^3605221 is an apocalyptic number.

It is an amenable number.

3605221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3605221 is an equidigital number, since it uses as much as digits as its factorization.

3605221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 3605221 is about 1898.7419519250. The cubic root of 3605221 is about 153.3359414595.

The spelling of 3605221 in words is "three million, six hundred five thousand, two hundred twenty-one".