31143112112 has 80 divisors (see below), whose sum is σ = 69952665600. Its totient is φ = 13155816960.

The previous prime is 31143112057. The next prime is 31143112159. The reversal of 31143112112 is 21121134113.

It is a super-2 number, since 2×31143112112² (a number of 22 digits) contains 22 as substring.

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, 3294689 + ... + 3304127.

It is an arithmetic number, because the mean of its divisors is an integer number (874408320).

Almost surely, 2^31143112112 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 31143112112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34976332800).

31143112112 is an abundant number, since it is smaller than the sum of its proper divisors (38809553488).

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

31143112112 is a wasteful number, since it uses less digits than its factorization.

31143112112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9874 (or 9868 counting only the distinct ones).

The product of its digits is 144, while the sum is 20.

Adding to 31143112112 its reverse (21121134113), we get a palindrome (52264246225).

The spelling of 31143112112 in words is "thirty-one billion, one hundred forty-three million, one hundred twelve thousand, one hundred twelve".