31531438848 has 216 divisors, whose sum is σ = 105131692848. Its totient is φ = 8315854848.

The previous prime is 31531438843. The next prime is 31531438849. The reversal of 31531438848 is 84883413513.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 31531438797 and 31531438806.

It is not an unprimeable number, because it can be changed into a prime (31531438843) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 456990 + ... + 521442.

Almost surely, 2^31531438848 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 31531438848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52565846424).

31531438848 is an abundant number, since it is smaller than the sum of its proper divisors (73600254000).

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

31531438848 is a wasteful number, since it uses less digits than its factorization.

31531438848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64499 (or 64478 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 48.

The spelling of 31531438848 in words is "thirty-one billion, five hundred thirty-one million, four hundred thirty-eight thousand, eight hundred forty-eight".