31540043444 has 108 divisors (see below), whose sum is σ = 70509888288. Its totient is φ = 12300724800.

The previous prime is 31540043429. The next prime is 31540043449. The reversal of 31540043444 is 44434004513.

It is a super-2 number, since 2×31540043444² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31540043444.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31540043449) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2345099 + ... + 2358509.

It is an arithmetic number, because the mean of its divisors is an integer number (652869336).

Almost surely, 2^31540043444 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 31540043444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35254944144).

31540043444 is an abundant number, since it is smaller than the sum of its proper divisors (38969844844).

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

31540043444 is a wasteful number, since it uses less digits than its factorization.

31540043444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13526 (or 13504 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 32.

Adding to 31540043444 its reverse (44434004513), we get a palindrome (75974047957).

The spelling of 31540043444 in words is "thirty-one billion, five hundred forty million, forty-three thousand, four hundred forty-four".