31310311332 has 96 divisors (see below), whose sum is σ = 78943092480. Its totient is φ = 9628917760.

The previous prime is 31310311321. The next prime is 31310311387. The reversal of 31310311332 is 23311301313.

It is a super-2 number, since 2×31310311332² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31310311299 and 31310311308.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13773748 + ... + 13776020.

It is an arithmetic number, because the mean of its divisors is an integer number (822323880).

Almost surely, 2^31310311332 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 31310311332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39471546240).

31310311332 is an abundant number, since it is smaller than the sum of its proper divisors (47632781148).

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

31310311332 is a wasteful number, since it uses less digits than its factorization.

31310311332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4053 (or 4051 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 21.

Adding to 31310311332 its reverse (23311301313), we get a palindrome (54621612645).

The spelling of 31310311332 in words is "thirty-one billion, three hundred ten million, three hundred eleven thousand, three hundred thirty-two".