31312897144 has 8 divisors (see below), whose sum is σ = 58711682160. Its totient is φ = 15656448568.

The previous prime is 31312897127. The next prime is 31312897151. The reversal of 31312897144 is 44179821313.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 31312897144.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1957056064 + ... + 1957056079.

It is an arithmetic number, because the mean of its divisors is an integer number (7338960270).

Almost surely, 2^31312897144 is an apocalyptic number.

It is an amenable number.

31312897144 is a deficient number, since it is larger than the sum of its proper divisors (27398785016).

31312897144 is a wasteful number, since it uses less digits than its factorization.

31312897144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3914112149 (or 3914112145 counting only the distinct ones).

The product of its digits is 145152, while the sum is 43.

The spelling of 31312897144 in words is "thirty-one billion, three hundred twelve million, eight hundred ninety-seven thousand, one hundred forty-four".