31871617452 has 96 divisors (see below), whose sum is σ = 86694451200. Its totient is φ = 10112558400.

The previous prime is 31871617441. The next prime is 31871617489. The reversal of 31871617452 is 25471617813.

31871617452 is a `hidden beast` number, since 3 + 187 + 1 + 6 + 17 + 452 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 31871617398 and 31871617407.

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 31 ways as a sum of consecutive naturals, for example, 126199 + ... + 282257.

It is an arithmetic number, because the mean of its divisors is an integer number (903067200).

Almost surely, 2^31871617452 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 31871617452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43347225600).

31871617452 is an abundant number, since it is smaller than the sum of its proper divisors (54822833748).

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

31871617452 is a wasteful number, since it uses less digits than its factorization.

31871617452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156164 (or 156156 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The spelling of 31871617452 in words is "thirty-one billion, eight hundred seventy-one million, six hundred seventeen thousand, four hundred fifty-two".