31131111120112 has 20 divisors (see below), whose sum is σ = 60317412650320. Its totient is φ = 15565327210368.

The previous prime is 31131111120107. The next prime is 31131111120113. The reversal of 31131111120112 is 21102111113113.

It is a super-2 number, since 2×31131111120112² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31131111120112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131111120113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13144428 + ... + 15330955.

It is an arithmetic number, because the mean of its divisors is an integer number (3015870632516).

Almost surely, 2^{31131111120112} is an apocalyptic number.

It is an amenable number.

31131111120112 is a deficient number, since it is larger than the sum of its proper divisors (29186301530208).

31131111120112 is a wasteful number, since it uses less digits than its factorization.

31131111120112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28543720 (or 28543714 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 19.

Adding to 31131111120112 its reverse (21102111113113), we get a palindrome (52233222233225).

The spelling of 31131111120112 in words is "thirty-one trillion, one hundred thirty-one billion, one hundred eleven million, one hundred twenty thousand, one hundred twelve".