3131311121 has 4 divisors (see below), whose sum is σ = 3138016752. Its totient is φ = 3124605492.

The previous prime is 3131311091. The next prime is 3131311123. The reversal of 3131311121 is 1211131313.

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 a cyclic number.

It is not a de Polignac number, because 3131311121 - 2¹⁴ = 3131294737 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 3131311121.

It is not an unprimeable number, because it can be changed into a prime (3131311123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3352115 + ... + 3353048.

It is an arithmetic number, because the mean of its divisors is an integer number (784504188).

Almost surely, 2^3131311121 is an apocalyptic number.

It is an amenable number.

3131311121 is a deficient number, since it is larger than the sum of its proper divisors (6705631).

3131311121 is an equidigital number, since it uses as much as digits as its factorization.

3131311121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6705630.

The product of its digits is 54, while the sum is 17.

The square root of 3131311121 is about 55958.1193483126. The cubic root of 3131311121 is about 1462.9924115495.

Adding to 3131311121 its reverse (1211131313), we get a palindrome (4342442434).

The spelling of 3131311121 in words is "three billion, one hundred thirty-one million, three hundred eleven thousand, one hundred twenty-one".