31144243312 has 80 divisors (see below), whose sum is σ = 75207408640. Its totient is φ = 12164795136.

The previous prime is 31144243309. The next prime is 31144243313. The reversal of 31144243312 is 21334244113.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31144243313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20358 + ... + 250405.

It is an arithmetic number, because the mean of its divisors is an integer number (940092608).

Almost surely, 2^31144243312 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 31144243312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37603704320).

31144243312 is an abundant number, since it is smaller than the sum of its proper divisors (44063165328).

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

31144243312 is a wasteful number, since it uses less digits than its factorization.

31144243312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270870 (or 270864 counting only the distinct ones).

The product of its digits is 6912, while the sum is 28.

Adding to 31144243312 its reverse (21334244113), we get a palindrome (52478487425).

The spelling of 31144243312 in words is "thirty-one billion, one hundred forty-four million, two hundred forty-three thousand, three hundred twelve".