311131033212 has 24 divisors (see below), whose sum is σ = 726540944976. Its totient is φ = 103629125248.

The previous prime is 311131033207. The next prime is 311131033219. The reversal of 311131033212 is 212330131113.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311131033219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10136433 + ... + 10167080.

It is an arithmetic number, because the mean of its divisors is an integer number (30272539374).

Almost surely, 2^311131033212 is an apocalyptic number.

It is an amenable number.

311131033212 is an abundant number, since it is smaller than the sum of its proper divisors (415409911764).

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

311131033212 is a wasteful number, since it uses less digits than its factorization.

311131033212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20304797 (or 20304795 counting only the distinct ones).

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

Adding to 311131033212 its reverse (212330131113), we get a palindrome (523461164325).

The spelling of 311131033212 in words is "three hundred eleven billion, one hundred thirty-one million, thirty-three thousand, two hundred twelve".