31121331112 has 16 divisors (see below), whose sum is σ = 61784995860. Its totient is φ = 14645332224.

The previous prime is 31121331089. The next prime is 31121331113. The reversal of 31121331112 is 21113312113.

It can be written as a sum of positive squares in 2 ways, for example, as 29968456996 + 1152874116 = 173114^2 + 33954^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31121331112.

It is not an unprimeable number, because it can be changed into a prime (31121331113) 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, 114416523 + ... + 114416794.

Almost surely, 2^31121331112 is an apocalyptic number.

It is an amenable number.

31121331112 is a deficient number, since it is larger than the sum of its proper divisors (30663664748).

31121331112 is a wasteful number, since it uses less digits than its factorization.

31121331112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228833340 (or 228833336 counting only the distinct ones).

The product of its digits is 108, while the sum is 19.

Adding to 31121331112 its reverse (21113312113), we get a palindrome (52234643225).

The spelling of 31121331112 in words is "thirty-one billion, one hundred twenty-one million, three hundred thirty-one thousand, one hundred twelve".