13031231112 has 96 divisors (see below), whose sum is σ = 35569923480. Its totient is φ = 4309770240.

The previous prime is 13031231107. The next prime is 13031231117. The reversal of 13031231112 is 21113213031.

13031231112 is a `hidden beast` number, since 1 + 30 + 312 + 311 + 12 = 666.

It is an interprime number because it is at equal distance from previous prime (13031231107) and next prime (13031231117).

It can be written as a sum of positive squares in 4 ways, for example, as 10963346436 + 2067884676 = 104706^2 + 45474^2 .

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 (13031231117) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7518598 + ... + 7520330.

Almost surely, 2^13031231112 is an apocalyptic number.

13031231112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13031231112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17784961740).

13031231112 is an abundant number, since it is smaller than the sum of its proper divisors (22538692368).

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

13031231112 is a wasteful number, since it uses less digits than its factorization.

13031231112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2503 (or 2496 counting only the distinct ones).

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

Adding to 13031231112 its reverse (21113213031), we get a palindrome (34144444143).

The spelling of 13031231112 in words is "thirteen billion, thirty-one million, two hundred thirty-one thousand, one hundred twelve".