31131203123112 has 128 divisors (see below), whose sum is σ = 84479459328000. Its totient is φ = 9522503871488.

The previous prime is 31131203123101. The next prime is 31131203123149. The reversal of 31131203123112 is 21132130213113.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1956889 + ... + 8129687.

It is an arithmetic number, because the mean of its divisors is an integer number (659995776000).

Almost surely, 2^{31131203123112} 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 31131203123112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42239729664000).

31131203123112 is an abundant number, since it is smaller than the sum of its proper divisors (53348256204888).

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

31131203123112 is a wasteful number, since it uses less digits than its factorization.

31131203123112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6173135 (or 6173131 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

Adding to 31131203123112 its reverse (21132130213113), we get a palindrome (52263333336225).

The spelling of 31131203123112 in words is "thirty-one trillion, one hundred thirty-one billion, two hundred three million, one hundred twenty-three thousand, one hundred twelve".