31143112 has 64 divisors (see below), whose sum is σ = 78422400. Its totient is φ = 11197440.

The previous prime is 31143103. The next prime is 31143113. The reversal of 31143112 is 21134113.

It is not an unprimeable number, because it can be changed into a prime (31143113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6064 + ... + 9952.

It is an arithmetic number, because the mean of its divisors is an integer number (1225350).

Almost surely, 2^31143112 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 31143112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39211200).

31143112 is an abundant number, since it is smaller than the sum of its proper divisors (47279288).

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

31143112 is a wasteful number, since it uses less digits than its factorization.

31143112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3926 (or 3922 counting only the distinct ones).

The product of its digits is 72, while the sum is 16.

The square root of 31143112 is about 5580.6014012828. The cubic root of 31143112 is about 314.6207310695.

Adding to 31143112 its reverse (21134113), we get a palindrome (52277225).

It can be divided in two parts, 3114 and 3112, that added together give a palindrome (6226).

The spelling of 31143112 in words is "thirty-one million, one hundred forty-three thousand, one hundred twelve".