31311000312 has 64 divisors (see below), whose sum is σ = 80385177600. Its totient is φ = 10158433920.

The previous prime is 31311000269. The next prime is 31311000313. The reversal of 31311000312 is 21300011313.

It is a junction number, because it is equal to n+sod(n) for n = 31311000291 and 31311000300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311000313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127489 + ... + 280847.

It is an arithmetic number, because the mean of its divisors is an integer number (1256018400).

Almost surely, 2^31311000312 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 31311000312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40192588800).

31311000312 is an abundant number, since it is smaller than the sum of its proper divisors (49074177288).

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

31311000312 is a wasteful number, since it uses less digits than its factorization.

31311000312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153596 (or 153592 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 15.

Adding to 31311000312 its reverse (21300011313), we get a palindrome (52611011625).

The spelling of 31311000312 in words is "thirty-one billion, three hundred eleven million, three hundred twelve", and thus it is an aban number.