31816530912 has 96 divisors (see below), whose sum is σ = 85192013088. Its totient is φ = 10393450496.

The previous prime is 31816530899. The next prime is 31816530919. The reversal of 31816530912 is 21903561813.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31816530919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5151058 + ... + 5157230.

It is an arithmetic number, because the mean of its divisors is an integer number (887416803).

Almost surely, 2^31816530912 is an apocalyptic number.

31816530912 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 31816530912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42596006544).

31816530912 is an abundant number, since it is smaller than the sum of its proper divisors (53375482176).

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

31816530912 is a wasteful number, since it uses less digits than its factorization.

31816530912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7252 (or 7244 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 39.

It can be divided in two parts, 318 and 16530912, that multiplied together give a square (5256830016 = 72504²).

The spelling of 31816530912 in words is "thirty-one billion, eight hundred sixteen million, five hundred thirty thousand, nine hundred twelve".