31012131012 has 24 divisors (see below), whose sum is σ = 74856868800. Its totient is φ = 9980915616.

The previous prime is 31012130977. The next prime is 31012131019. The reversal of 31012131012 is 21013121013.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31012130982 and 31012131000.

It is not an unprimeable number, because it can be changed into a prime (31012131019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44557312 + ... + 44558007.

It is an arithmetic number, because the mean of its divisors is an integer number (3119036200).

Almost surely, 2^31012131012 is an apocalyptic number.

It is an amenable number.

31012131012 is an abundant number, since it is smaller than the sum of its proper divisors (43844737788).

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

31012131012 is a wasteful number, since it uses less digits than its factorization.

31012131012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89115355 (or 89115353 counting only the distinct ones).

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

Adding to 31012131012 its reverse (21013121013), we get a palindrome (52025252025).

Subtracting from 31012131012 its reverse (21013121013), we obtain a palindrome (9999009999).

The spelling of 31012131012 in words is "thirty-one billion, twelve million, one hundred thirty-one thousand, twelve".