31133113212 has 48 divisors (see below), whose sum is σ = 75174019200. Its totient is φ = 10016502720.

The previous prime is 31133113189. The next prime is 31133113213. The reversal of 31133113212 is 21231133113.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31133113213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1159839 + ... + 1186377.

It is an arithmetic number, because the mean of its divisors is an integer number (1566125400).

Almost surely, 2^31133113212 is an apocalyptic number.

It is an amenable number.

31133113212 is an abundant number, since it is smaller than the sum of its proper divisors (44040905988).

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

31133113212 is a wasteful number, since it uses less digits than its factorization.

31133113212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29946 (or 29944 counting only the distinct ones).

The product of its digits is 324, while the sum is 21.

Adding to 31133113212 its reverse (21231133113), we get a palindrome (52364246325).

The spelling of 31133113212 in words is "thirty-one billion, one hundred thirty-three million, one hundred thirteen thousand, two hundred twelve".