31143344140 has 24 divisors (see below), whose sum is σ = 69248142432. Its totient is φ = 11724552960.

The previous prime is 31143344083. The next prime is 31143344147. The reversal of 31143344140 is 4144334113.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31143344099 and 31143344108.

It is not an unprimeable number, because it can be changed into a prime (31143344147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45798696 + ... + 45799375.

It is an arithmetic number, because the mean of its divisors is an integer number (2885339268).

Almost surely, 2^31143344140 is an apocalyptic number.

It is an amenable number.

31143344140 is an abundant number, since it is smaller than the sum of its proper divisors (38104798292).

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

31143344140 is a wasteful number, since it uses less digits than its factorization.

31143344140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91598097 (or 91598095 counting only the distinct ones).

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

Adding to 31143344140 its reverse (4144334113), we get a palindrome (35287678253).

The spelling of 31143344140 in words is "thirty-one billion, one hundred forty-three million, three hundred forty-four thousand, one hundred forty".