31130123112 has 192 divisors, whose sum is σ = 93013876800. Its totient is φ = 9327467520.

The previous prime is 31130123069. The next prime is 31130123117. The reversal of 31130123112 is 21132103113.

31130123112 is a `hidden beast` number, since 311 + 30 + 12 + 311 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (31130123117) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 41122638 + ... + 41123394.

It is an arithmetic number, because the mean of its divisors is an integer number (484447275).

Almost surely, 2^31130123112 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 31130123112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46506938400).

31130123112 is an abundant number, since it is smaller than the sum of its proper divisors (61883753688).

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

31130123112 is a wasteful number, since it uses less digits than its factorization.

31130123112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296 (or 1289 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31130123112 its reverse (21132103113), we get a palindrome (52262226225).

The spelling of 31130123112 in words is "thirty-one billion, one hundred thirty million, one hundred twenty-three thousand, one hundred twelve".