31112111012 has 12 divisors (see below), whose sum is σ = 54449456796.
Its totient is φ = 15555123360.
The previous prime is 31112111011. The next prime is 31112111029. The reversal of 31112111012 is 21011121113.
It can be written as a sum of positive squares in 2 ways, for example, as 12308571136 + 18803539876 = 110944^2 + 137126^2
It is not an unprimeable number, because it can be changed into a prime (31112111011) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155039 + ... + 293702.
It is an arithmetic number, because the mean of its divisors is an integer number (4537454733).
Almost surely, 231112111012 is an apocalyptic number.
It is an amenable number.
31112111012 is a deficient number, since it is larger than the sum of its proper divisors (23337345784).
31112111012 is a wasteful number, since it uses less digits than its factorization.
31112111012 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 466078 (or 466076 counting only the distinct ones).
The product of its (nonzero) digits is 12, while the sum is 14.
Adding to 31112111012 its reverse (21011121113), we get a palindrome (52123232125).
The spelling of 31112111012 in words is "thirty-one billion, one hundred twelve million, one hundred eleven thousand, twelve".