31531322130 has 384 divisors, whose sum is σ = 104602752000. Its totient is φ = 5991390720.

The previous prime is 31531322083. The next prime is 31531322143. The reversal of 31531322130 is 3122313513.

It is a self number, because there is not a number n which added to its sum of digits gives 31531322130.

It is an unprimeable number.

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 191 ways as a sum of consecutive naturals, for example, 8907901 + ... + 8911439.

It is an arithmetic number, because the mean of its divisors is an integer number (272403000).

Almost surely, 2^31531322130 is an apocalyptic number.

31531322130 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31531322130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52301376000).

31531322130 is an abundant number, since it is smaller than the sum of its proper divisors (73071429870).

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

31531322130 is a wasteful number, since it uses less digits than its factorization.

31531322130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3622 (or 3615 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 24.

Adding to 31531322130 its reverse (3122313513), we get a palindrome (34653635643).

The spelling of 31531322130 in words is "thirty-one billion, five hundred thirty-one million, three hundred twenty-two thousand, one hundred thirty".