31531357312 has 192 divisors, whose sum is σ = 79038771840. Its totient is φ = 12419205120.

The previous prime is 31531357289. The next prime is 31531357327. The reversal of 31531357312 is 21375313513.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22095543 + ... + 22096969.

It is an arithmetic number, because the mean of its divisors is an integer number (411660270).

Almost surely, 2^31531357312 is an apocalyptic number.

31531357312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31531357312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39519385920).

31531357312 is an abundant number, since it is smaller than the sum of its proper divisors (47507414528).

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

31531357312 is a wasteful number, since it uses less digits than its factorization.

31531357312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739 (or 1720 counting only the distinct ones).

The product of its digits is 28350, while the sum is 34.

The spelling of 31531357312 in words is "thirty-one billion, five hundred thirty-one million, three hundred fifty-seven thousand, three hundred twelve".