31291284472 has 64 divisors (see below), whose sum is σ = 67496889600. Its totient is φ = 13322016000.

The previous prime is 31291284469. The next prime is 31291284473. The reversal of 31291284472 is 27448219213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31291284473) 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 15 ways as a sum of consecutive naturals, for example, 5746183 + ... + 5751625.

It is an arithmetic number, because the mean of its divisors is an integer number (1054638900).

Almost surely, 2^31291284472 is an apocalyptic number.

It is an amenable number.

31291284472 is an abundant number, since it is smaller than the sum of its proper divisors (36205605128).

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

31291284472 is a wasteful number, since it uses less digits than its factorization.

31291284472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6116 (or 6112 counting only the distinct ones).

The product of its digits is 193536, while the sum is 43.

The spelling of 31291284472 in words is "thirty-one billion, two hundred ninety-one million, two hundred eighty-four thousand, four hundred seventy-two".