31311001212 has 24 divisors (see below), whose sum is σ = 75033571536. Its totient is φ = 10154919168.

The previous prime is 31311001199. The next prime is 31311001243. The reversal of 31311001212 is 21210011313.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31311001191 and 31311001200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35259693 + ... + 35260580.

It is an arithmetic number, because the mean of its divisors is an integer number (3126398814).

Almost surely, 2^31311001212 is an apocalyptic number.

It is an amenable number.

31311001212 is an abundant number, since it is smaller than the sum of its proper divisors (43722570324).

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

31311001212 is a wasteful number, since it uses less digits than its factorization.

31311001212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70520317 (or 70520315 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 31311001212 its reverse (21210011313), we get a palindrome (52521012525).

The spelling of 31311001212 in words is "thirty-one billion, three hundred eleven million, one thousand, two hundred twelve".