31240412112 has 320 divisors, whose sum is σ = 101073530880. Its totient is φ = 8095997952.

The previous prime is 31240412107. The next prime is 31240412143. The reversal of 31240412112 is 21121404213.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 82428339 + ... + 82428717.

It is an arithmetic number, because the mean of its divisors is an integer number (315854784).

Almost surely, 2^31240412112 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 31240412112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50536765440).

31240412112 is an abundant number, since it is smaller than the sum of its proper divisors (69833118768).

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

31240412112 is a wasteful number, since it uses less digits than its factorization.

31240412112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690 (or 684 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 31240412112 its reverse (21121404213), we get a palindrome (52361816325).

The spelling of 31240412112 in words is "thirty-one billion, two hundred forty million, four hundred twelve thousand, one hundred twelve".