31781248383612 has 576 divisors, whose sum is σ = 103972294863360. Its totient is φ = 7442465587200.

The previous prime is 31781248383587. The next prime is 31781248383613. The reversal of 31781248383612 is 21638384218713.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31781248383613) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 595005187 + ... + 595058597.

It is an arithmetic number, because the mean of its divisors is an integer number (180507456360).

Almost surely, 2^{31781248383612} 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 31781248383612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51986147431680).

31781248383612 is an abundant number, since it is smaller than the sum of its proper divisors (72191046479748).

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

31781248383612 is a wasteful number, since it uses less digits than its factorization.

31781248383612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53722 (or 53713 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 57.

The spelling of 31781248383612 in words is "thirty-one trillion, seven hundred eighty-one billion, two hundred forty-eight million, three hundred eighty-three thousand, six hundred twelve".