31981415980 has 144 divisors (see below), whose sum is σ = 74892432384. Its totient is φ = 11452129920.

The previous prime is 31981415959. The next prime is 31981415987. The reversal of 31981415980 is 8951418913.

It is not an unprimeable number, because it can be changed into a prime (31981415987) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9622599 + ... + 9625921.

It is an arithmetic number, because the mean of its divisors is an integer number (520086336).

Almost surely, 2^31981415980 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 31981415980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37446216192).

31981415980 is an abundant number, since it is smaller than the sum of its proper divisors (42911016404).

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

31981415980 is a wasteful number, since it uses less digits than its factorization.

31981415980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3444 (or 3423 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 49.

The spelling of 31981415980 in words is "thirty-one billion, nine hundred eighty-one million, four hundred fifteen thousand, nine hundred eighty".