31585043997 has 48 divisors (see below), whose sum is σ = 50882098176. Its totient is φ = 18748800000.

The previous prime is 31585043953. The next prime is 31585044019. The reversal of 31585043997 is 79934058513.

31585043997 is a `hidden beast` number, since 3 + 15 + 8 + 504 + 39 + 97 = 666.

It is not a de Polignac number, because 31585043997 - 2⁶ = 31585043933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31585043197) 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 47 ways as a sum of consecutive naturals, for example, 1113997 + ... + 1141997.

It is an arithmetic number, because the mean of its divisors is an integer number (1060043712).

Almost surely, 2^31585043997 is an apocalyptic number.

It is an amenable number.

31585043997 is a deficient number, since it is larger than the sum of its proper divisors (19297054179).

31585043997 is a wasteful number, since it uses less digits than its factorization.

31585043997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28362 (or 28359 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 54.

The spelling of 31585043997 in words is "thirty-one billion, five hundred eighty-five million, forty-three thousand, nine hundred ninety-seven".