3131311212 has 18 divisors (see below), whose sum is σ = 7915258988. Its totient is φ = 1043770392.

The previous prime is 3131311201. The next prime is 3131311219. The reversal of 3131311212 is 2121131313.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

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

It is not an unprimeable number, because it can be changed into a prime (3131311219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43490398 + ... + 43490469.

Almost surely, 2^3131311212 is an apocalyptic number.

It is an amenable number.

3131311212 is an abundant number, since it is smaller than the sum of its proper divisors (4783947776).

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

3131311212 is a wasteful number, since it uses less digits than its factorization.

3131311212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86980877 (or 86980872 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 3131311212 is about 55958.1201614207. The cubic root of 3131311212 is about 1462.9924257216.

Adding to 3131311212 its reverse (2121131313), we get a palindrome (5252442525).

The spelling of 3131311212 in words is "three billion, one hundred thirty-one million, three hundred eleven thousand, two hundred twelve".