31440144142 has 12 divisors (see below), whose sum is σ = 51837262848. Its totient is φ = 14290974500.

The previous prime is 31440144133. The next prime is 31440144143. The reversal of 31440144142 is 24144104413.

It is a self number, because there is not a number n which added to its sum of digits gives 31440144142.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31440144143) 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 5 ways as a sum of consecutive naturals, for example, 64958734 + ... + 64959217.

It is an arithmetic number, because the mean of its divisors is an integer number (4319771904).

Almost surely, 2^31440144142 is an apocalyptic number.

31440144142 is a deficient number, since it is larger than the sum of its proper divisors (20397118706).

31440144142 is a wasteful number, since it uses less digits than its factorization.

31440144142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129917975 (or 129917964 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 31440144142 its reverse (24144104413), we get a palindrome (55584248555).

The spelling of 31440144142 in words is "thirty-one billion, four hundred forty million, one hundred forty-four thousand, one hundred forty-two".