31591871040 has 224 divisors, whose sum is σ = 103674525696. Its totient is φ = 8145141760.

The previous prime is 31591871033. The next prime is 31591871041. The reversal of 31591871040 is 4017819513.

It is a self number, because there is not a number n which added to its sum of digits gives 31591871040.

It is not an unprimeable number, because it can be changed into a prime (31591871041) 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, 4444129 + ... + 4451231.

It is an arithmetic number, because the mean of its divisors is an integer number (462832704).

Almost surely, 2^31591871040 is an apocalyptic number.

31591871040 is a gapful number since it is divisible by the number (30) 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 31591871040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51837262848).

31591871040 is an abundant number, since it is smaller than the sum of its proper divisors (72082654656).

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

31591871040 is a wasteful number, since it uses less digits than its factorization.

31591871040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7277 (or 7267 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 39.

The spelling of 31591871040 in words is "thirty-one billion, five hundred ninety-one million, eight hundred seventy-one thousand, forty".