31213040144 has 80 divisors (see below), whose sum is σ = 71474175360. Its totient is φ = 13017799680.

The previous prime is 31213040099. The next prime is 31213040239. The reversal of 31213040144 is 44104031213.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 341252 + ... + 422940.

It is an arithmetic number, because the mean of its divisors is an integer number (893427192).

Almost surely, 2^31213040144 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 31213040144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35737087680).

31213040144 is an abundant number, since it is smaller than the sum of its proper divisors (40261135216).

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

31213040144 is a wasteful number, since it uses less digits than its factorization.

31213040144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81888 (or 81882 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 31213040144 its reverse (44104031213), we get a palindrome (75317071357).

The spelling of 31213040144 in words is "thirty-one billion, two hundred thirteen million, forty thousand, one hundred forty-four".