31310113212 has 288 divisors, whose sum is σ = 96669081600. Its totient is φ = 8355156480.

The previous prime is 31310113201. The next prime is 31310113217. The reversal of 31310113212 is 21231101313.

31310113212 is a `hidden beast` number, since 31 + 310 + 1 + 1 + 321 + 2 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31310113217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 43067193 + ... + 43067919.

Almost surely, 2^31310113212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31310113212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48334540800).

31310113212 is an abundant number, since it is smaller than the sum of its proper divisors (65358968388).

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

31310113212 is a wasteful number, since it uses less digits than its factorization.

31310113212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961 (or 956 counting only the distinct ones).

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

Adding to 31310113212 its reverse (21231101313), we get a palindrome (52541214525).

The spelling of 31310113212 in words is "thirty-one billion, three hundred ten million, one hundred thirteen thousand, two hundred twelve".