3631221 has 24 divisors (see below), whose sum is σ = 5861856. Its totient is φ = 2147040.

The previous prime is 3631219. The next prime is 3631237. The reversal of 3631221 is 1221363.

It is not a de Polignac number, because 3631221 - 2¹ = 3631219 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3631194 and 3631203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3631211) 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 in 23 ways as a sum of consecutive naturals, for example, 3831 + ... + 4683.

It is an arithmetic number, because the mean of its divisors is an integer number (244244).

Almost surely, 2^3631221 is an apocalyptic number.

It is an amenable number.

3631221 is a deficient number, since it is larger than the sum of its proper divisors (2230635).

3631221 is a wasteful number, since it uses less digits than its factorization.

3631221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913 (or 910 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 3631221 is about 1905.5762907845. The cubic root of 3631221 is about 153.7036663875.

Adding to 3631221 its reverse (1221363), we get a palindrome (4852584).

The spelling of 3631221 in words is "three million, six hundred thirty-one thousand, two hundred twenty-one".