31123233012 has 48 divisors (see below), whose sum is σ = 75934236672. Its totient is φ = 9902930400.

The previous prime is 31123232981. The next prime is 31123233049. The reversal of 31123233012 is 21033232113.

It is a self number, because there is not a number n which added to its sum of digits gives 31123233012.

It is a congruent number.

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, 18637 + ... + 250187.

It is an arithmetic number, because the mean of its divisors is an integer number (1581963264).

Almost surely, 2^31123233012 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 31123233012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37967118336).

31123233012 is an abundant number, since it is smaller than the sum of its proper divisors (44811003660).

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

31123233012 is a wasteful number, since it uses less digits than its factorization.

31123233012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232068 (or 232066 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31123233012 its reverse (21033232113), we get a palindrome (52156465125).

The spelling of 31123233012 in words is "thirty-one billion, one hundred twenty-three million, two hundred thirty-three thousand, twelve".