3121131112 has 64 divisors (see below), whose sum is σ = 6481362240. Its totient is φ = 1408904640.

The previous prime is 3121131107. The next prime is 3121131127. The reversal of 3121131112 is 2111311213.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1670803 + ... + 1672669.

It is an arithmetic number, because the mean of its divisors is an integer number (101271285).

Almost surely, 2^3121131112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3121131112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3240681120).

3121131112 is an abundant number, since it is smaller than the sum of its proper divisors (3360231128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3121131112 is a wasteful number, since it uses less digits than its factorization.

3121131112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2063 (or 2037 counting only the distinct ones).

The product of its digits is 36, while the sum is 16.

The square root of 3121131112 is about 55867.0843341587. The cubic root of 3121131112 is about 1461.4052760988.

Adding to 3121131112 its reverse (2111311213), we get a palindrome (5232442325).

The spelling of 3121131112 in words is "three billion, one hundred twenty-one million, one hundred thirty-one thousand, one hundred twelve".