31530198912 has 128 divisors (see below), whose sum is σ = 85672166400. Its totient is φ = 10269849600.

The previous prime is 31530198893. The next prime is 31530198913. The reversal of 31530198912 is 21989103513.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31530198913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16585162 + ... + 16587062.

It is an arithmetic number, because the mean of its divisors is an integer number (669313800).

Almost surely, 2^31530198912 is an apocalyptic number.

31530198912 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 31530198912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42836083200).

31530198912 is an abundant number, since it is smaller than the sum of its proper divisors (54141967488).

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

31530198912 is a wasteful number, since it uses less digits than its factorization.

31530198912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2884 (or 2872 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 42.

The spelling of 31530198912 in words is "thirty-one billion, five hundred thirty million, one hundred ninety-eight thousand, nine hundred twelve".