31320243144 has 144 divisors (see below), whose sum is σ = 89524431360. Its totient is φ = 9887313600.

The previous prime is 31320243079. The next prime is 31320243173. The reversal of 31320243144 is 44134202313.

31320243144 is a `hidden beast` number, since 3 + 1 + 320 + 24 + 314 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3247209 + ... + 3256839.

It is an arithmetic number, because the mean of its divisors is an integer number (621697440).

Almost surely, 2^31320243144 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 31320243144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44762215680).

31320243144 is an abundant number, since it is smaller than the sum of its proper divisors (58204188216).

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

31320243144 is a wasteful number, since it uses less digits than its factorization.

31320243144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9752 (or 9714 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 31320243144 its reverse (44134202313), we get a palindrome (75454445457).

The spelling of 31320243144 in words is "thirty-one billion, three hundred twenty million, two hundred forty-three thousand, one hundred forty-four".