31871313432 has 192 divisors, whose sum is σ = 106537788000. Its totient is φ = 8792001792.

The previous prime is 31871313421. The next prime is 31871313437. The reversal of 31871313432 is 23431317813.

31871313432 is a `hidden beast` number, since 3 + 187 + 131 + 343 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31871313437) 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 47 ways as a sum of consecutive naturals, for example, 255018 + ... + 358854.

Almost surely, 2^31871313432 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 31871313432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53268894000).

31871313432 is an abundant number, since it is smaller than the sum of its proper divisors (74666474568).

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

31871313432 is a wasteful number, since it uses less digits than its factorization.

31871313432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103895 (or 103878 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The spelling of 31871313432 in words is "thirty-one billion, eight hundred seventy-one million, three hundred thirteen thousand, four hundred thirty-two".