3613221 has 16 divisors (see below), whose sum is σ = 5392320. Its totient is φ = 2391120.

The previous prime is 3613217. The next prime is 3613237. The reversal of 3613221 is 1223163.

It is not a de Polignac number, because 3613221 - 2² = 3613217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3613194 and 3613203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3613201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3991 + ... + 4811.

It is an arithmetic number, because the mean of its divisors is an integer number (337020).

Almost surely, 2^3613221 is an apocalyptic number.

It is an amenable number.

3613221 is a deficient number, since it is larger than the sum of its proper divisors (1779099).

3613221 is a wasteful number, since it uses less digits than its factorization.

3613221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993 (or 987 counting only the distinct ones).

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

The square root of 3613221 is about 1900.8474425898. The cubic root of 3613221 is about 153.4492753631.

Adding to 3613221 its reverse (1223163), we get a palindrome (4836384).

The spelling of 3613221 in words is "three million, six hundred thirteen thousand, two hundred twenty-one".