31123313212 has 24 divisors (see below), whose sum is σ = 54596775296. Its totient is φ = 15524269488.

The previous prime is 31123313209. The next prime is 31123313219. The reversal of 31123313212 is 21231332113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123313219) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5473723 + ... + 5479405.

Almost surely, 2^31123313212 is an apocalyptic number.

It is an amenable number.

31123313212 is a deficient number, since it is larger than the sum of its proper divisors (23473462084).

31123313212 is a wasteful number, since it uses less digits than its factorization.

31123313212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8737 (or 8735 counting only the distinct ones).

The product of its digits is 648, while the sum is 22.

Adding to 31123313212 its reverse (21231332113), we get a palindrome (52354645325).

The spelling of 31123313212 in words is "thirty-one billion, one hundred twenty-three million, three hundred thirteen thousand, two hundred twelve".