31123313016612 has 96 divisors (see below), whose sum is σ = 75601632960000. Its totient is φ = 9953351192064.

The previous prime is 31123313016611. The next prime is 31123313016619. The reversal of 31123313016612 is 21661031332113.

It is a super-2 number, since 2×31123313016612² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31123313016611) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40179589 + ... + 40946867.

It is an arithmetic number, because the mean of its divisors is an integer number (787517010000).

Almost surely, 2^{31123313016612} 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 31123313016612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37800816480000).

31123313016612 is an abundant number, since it is smaller than the sum of its proper divisors (44478319943388).

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

31123313016612 is a wasteful number, since it uses less digits than its factorization.

31123313016612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768053 (or 768051 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 33.

Adding to 31123313016612 its reverse (21661031332113), we get a palindrome (52784344348725).

The spelling of 31123313016612 in words is "thirty-one trillion, one hundred twenty-three billion, three hundred thirteen million, sixteen thousand, six hundred twelve".