31131122312 has 16 divisors (see below), whose sum is σ = 60253785600. Its totient is φ = 15063446160.

The previous prime is 31131122237. The next prime is 31131122353. The reversal of 31131122312 is 21322113113.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62764112 + ... + 62764607.

It is an arithmetic number, because the mean of its divisors is an integer number (3765861600).

Almost surely, 2^31131122312 is an apocalyptic number.

It is an amenable number.

31131122312 is a deficient number, since it is larger than the sum of its proper divisors (29122663288).

31131122312 is a wasteful number, since it uses less digits than its factorization.

31131122312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125528756 (or 125528752 counting only the distinct ones).

The product of its digits is 216, while the sum is 20.

Adding to 31131122312 its reverse (21322113113), we get a palindrome (52453235425).

The spelling of 31131122312 in words is "thirty-one billion, one hundred thirty-one million, one hundred twenty-two thousand, three hundred twelve".