3181121 has 4 divisors (see below), whose sum is σ = 3224772. Its totient is φ = 3137472.

The previous prime is 3181111. The next prime is 3181163. The reversal of 3181121 is 1211813.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1290496 + 1890625 = 1136^2 + 1375^2 .

It is a cyclic number.

It is not a de Polignac number, because 3181121 - 2¹⁸ = 2918977 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3181121.

It is not an unprimeable number, because it can be changed into a prime (3181111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21716 + ... + 21861.

It is an arithmetic number, because the mean of its divisors is an integer number (806193).

Almost surely, 2^3181121 is an apocalyptic number.

It is an amenable number.

3181121 is a deficient number, since it is larger than the sum of its proper divisors (43651).

3181121 is an equidigital number, since it uses as much as digits as its factorization.

3181121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43650.

The product of its digits is 48, while the sum is 17.

The square root of 3181121 is about 1783.5697351099. The cubic root of 3181121 is about 147.0708930423.

Adding to 3181121 its reverse (1211813), we get a palindrome (4392934).

The spelling of 3181121 in words is "three million, one hundred eighty-one thousand, one hundred twenty-one".