31231331212 has 6 divisors (see below), whose sum is σ = 54654829628. Its totient is φ = 15615665604.

The previous prime is 31231331191. The next prime is 31231331213. The reversal of 31231331212 is 21213313213.

It is not an unprimeable number, because it can be changed into a prime (31231331213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3903916398 + ... + 3903916405.

Almost surely, 2^31231331212 is an apocalyptic number.

It is an amenable number.

31231331212 is a deficient number, since it is larger than the sum of its proper divisors (23423498416).

31231331212 is a wasteful number, since it uses less digits than its factorization.

31231331212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7807832807 (or 7807832805 counting only the distinct ones).

The product of its digits is 648, while the sum is 22.

Adding to 31231331212 its reverse (21213313213), we get a palindrome (52444644425).

The spelling of 31231331212 in words is "thirty-one billion, two hundred thirty-one million, three hundred thirty-one thousand, two hundred twelve".