31021871804 has 96 divisors (see below), whose sum is σ = 69638693376. Its totient is φ = 11742382080.

The previous prime is 31021871747. The next prime is 31021871819. The reversal of 31021871804 is 40817812013.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1496132 + ... + 1516724.

It is an arithmetic number, because the mean of its divisors is an integer number (725403056).

Almost surely, 2^31021871804 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 31021871804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34819346688).

31021871804 is an abundant number, since it is smaller than the sum of its proper divisors (38616821572).

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

31021871804 is a wasteful number, since it uses less digits than its factorization.

31021871804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20755 (or 20753 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 35.

The spelling of 31021871804 in words is "thirty-one billion, twenty-one million, eight hundred seventy-one thousand, eight hundred four".