31131320012 has 24 divisors (see below), whose sum is σ = 59218898256. Its totient is φ = 14234015808.

The previous prime is 31131319993. The next prime is 31131320021. The reversal of 31131320012 is 21002313113.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2792003 + ... + 2803130.

It is an arithmetic number, because the mean of its divisors is an integer number (2467454094).

Almost surely, 2^31131320012 is an apocalyptic number.

It is an amenable number.

31131320012 is a deficient number, since it is larger than the sum of its proper divisors (28087578244).

31131320012 is a wasteful number, since it uses less digits than its factorization.

31131320012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5595257 (or 5595255 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31131320012 its reverse (21002313113), we get a palindrome (52133633125).

The spelling of 31131320012 in words is "thirty-one billion, one hundred thirty-one million, three hundred twenty thousand, twelve".