3031221 has 4 divisors (see below), whose sum is σ = 4041632. Its totient is φ = 2020812.

The previous prime is 3031201. The next prime is 3031247. The reversal of 3031221 is 1221303.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 3031221 - 2⁶ = 3031157 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3031197 and 3031206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3031201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505201 + ... + 505206.

It is an arithmetic number, because the mean of its divisors is an integer number (1010408).

Almost surely, 2^3031221 is an apocalyptic number.

It is an amenable number.

3031221 is a deficient number, since it is larger than the sum of its proper divisors (1010411).

3031221 is a wasteful number, since it uses less digits than its factorization.

3031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010410.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 3031221 is about 1741.0402063135. The cubic root of 3031221 is about 144.7235477747.

Adding to 3031221 its reverse (1221303), we get a palindrome (4252524).

It can be divided in two parts, 303 and 1221, that multiplied together give a palindrome (369963).

The spelling of 3031221 in words is "three million, thirty-one thousand, two hundred twenty-one".