31212312 has 32 divisors (see below), whose sum is σ = 80142000. Its totient is φ = 10122624.

The previous prime is 31212301. The next prime is 31212341. The reversal of 31212312 is 21321213.

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

It is a junction number, because it is equal to n+sod(n) for n = 31212291 and 31212300.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16687 + ... + 18462.

Almost surely, 2^31212312 is an apocalyptic number.

It is an amenable number.

31212312 is an abundant number, since it is smaller than the sum of its proper divisors (48929688).

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

31212312 is a wasteful number, since it uses less digits than its factorization.

31212312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35195 (or 35191 counting only the distinct ones).

The product of its digits is 72, while the sum is 15.

The square root of 31212312 is about 5586.7980095937. The cubic root of 31212312 is about 314.8535877908.

Adding to 31212312 its reverse (21321213), we get a palindrome (52533525).

The spelling of 31212312 in words is "thirty-one million, two hundred twelve thousand, three hundred twelve".