31440134442 has 16 divisors (see below), whose sum is σ = 66189756960. Its totient is φ = 9928463472.

The previous prime is 31440134437. The next prime is 31440134449. The reversal of 31440134442 is 24443104413.

It is not an unprimeable number, because it can be changed into a prime (31440134449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137895213 + ... + 137895440.

It is an arithmetic number, because the mean of its divisors is an integer number (4136859810).

Almost surely, 2^31440134442 is an apocalyptic number.

31440134442 is an abundant number, since it is smaller than the sum of its proper divisors (34749622518).

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

31440134442 is a wasteful number, since it uses less digits than its factorization.

31440134442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275790677.

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 31440134442 its reverse (24443104413), we get a palindrome (55883238855).

It can be divided in two parts, 314401 and 34442, that added together give a palindrome (348843).

The spelling of 31440134442 in words is "thirty-one billion, four hundred forty million, one hundred thirty-four thousand, four hundred forty-two".