3635221 has 2 divisors, whose sum is σ = 3635222. Its totient is φ = 3635220.

The previous prime is 3635209. The next prime is 3635227. The reversal of 3635221 is 1225363.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2604996 + 1030225 = 1614^2 + 1015^2 .

It is a cyclic number.

It is not a de Polignac number, because 3635221 - 2⁵ = 3635189 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 3635192 and 3635201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3635227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1817610 + 1817611.

It is an arithmetic number, because the mean of its divisors is an integer number (1817611).

Almost surely, 2^3635221 is an apocalyptic number.

It is an amenable number.

3635221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3635221 is an equidigital number, since it uses as much as digits as its factorization.

3635221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 22.

The square root of 3635221 is about 1906.6255531698. The cubic root of 3635221 is about 153.7600835037.

The spelling of 3635221 in words is "three million, six hundred thirty-five thousand, two hundred twenty-one".