31321500312 has 128 divisors (see below), whose sum is σ = 83633679360. Its totient is φ = 9760558080.

The previous prime is 31321500311. The next prime is 31321500341. The reversal of 31321500312 is 21300512313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321500311) 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, 2235553 + ... + 2249519.

It is an arithmetic number, because the mean of its divisors is an integer number (653388120).

Almost surely, 2^31321500312 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 31321500312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41816839680).

31321500312 is an abundant number, since it is smaller than the sum of its proper divisors (52312179048).

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

31321500312 is a wasteful number, since it uses less digits than its factorization.

31321500312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14113 (or 14109 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The spelling of 31321500312 in words is "thirty-one billion, three hundred twenty-one million, five hundred thousand, three hundred twelve".