31543130444 has 72 divisors (see below), whose sum is σ = 65406474000. Its totient is φ = 13269408768.

The previous prime is 31543130429. The next prime is 31543130449. The reversal of 31543130444 is 44403134513.

It is a self number, because there is not a number n which added to its sum of digits gives 31543130444.

It is not an unprimeable number, because it can be changed into a prime (31543130449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2418212 + ... + 2431220.

It is an arithmetic number, because the mean of its divisors is an integer number (908423250).

Almost surely, 2^31543130444 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 31543130444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32703237000).

31543130444 is an abundant number, since it is smaller than the sum of its proper divisors (33863343556).

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

31543130444 is a wasteful number, since it uses less digits than its factorization.

31543130444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13255 (or 13246 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 32.

Adding to 31543130444 its reverse (44403134513), we get a palindrome (75946264957).

The spelling of 31543130444 in words is "thirty-one billion, five hundred forty-three million, one hundred thirty thousand, four hundred forty-four".