3111221 has 8 divisors (see below), whose sum is σ = 3314520. Its totient is φ = 2910208.

The previous prime is 3111217. The next prime is 3111223. The reversal of 3111221 is 1221113.

It can be written as a sum of positive squares in 4 ways, for example, as 819025 + 2292196 = 905^2 + 1514^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3111221 - 2² = 3111217 is a prime.

It is a super-2 number, since 2×3111221² = 19359392221682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3111223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2885 + ... + 3813.

It is an arithmetic number, because the mean of its divisors is an integer number (414315).

Almost surely, 2^3111221 is an apocalyptic number.

It is an amenable number.

3111221 is a deficient number, since it is larger than the sum of its proper divisors (203299).

3111221 is a wasteful number, since it uses less digits than its factorization.

3111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143.

The product of its digits is 12, while the sum is 11.

The square root of 3111221 is about 1763.8653576733. The cubic root of 3111221 is about 145.9856900968.

Adding to 3111221 its reverse (1221113), we get a palindrome (4332334).

The spelling of 3111221 in words is "three million, one hundred eleven thousand, two hundred twenty-one".