3131111121 has 12 divisors (see below), whose sum is σ = 4323741552. Its totient is φ = 2015426224.

The previous prime is 3131111101. The next prime is 3131111149. The reversal of 3131111121 is 1211111313.

It is not a de Polignac number, because 3131111121 - 2¹¹ = 3131109073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3131111121.

It is not an unprimeable number, because it can be changed into a prime (3131111101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 617991 + ... + 623036.

It is an arithmetic number, because the mean of its divisors is an integer number (360311796).

Almost surely, 2^3131111121 is an apocalyptic number.

It is an amenable number.

3131111121 is a deficient number, since it is larger than the sum of its proper divisors (1192630431).

3131111121 is a wasteful number, since it uses less digits than its factorization.

3131111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241088 (or 1241059 counting only the distinct ones).

The product of its digits is 18, while the sum is 15.

The square root of 3131111121 is about 55956.3322690113. The cubic root of 3131111121 is about 1462.9612632859.

Adding to 3131111121 its reverse (1211111313), we get a palindrome (4342222434).

The spelling of 3131111121 in words is "three billion, one hundred thirty-one million, one hundred eleven thousand, one hundred twenty-one".