31384438905 has 96 divisors (see below), whose sum is σ = 55595289600. Its totient is φ = 15063797760.

The previous prime is 31384438903. The next prime is 31384438907. The reversal of 31384438905 is 50983448313.

It is an interprime number because it is at equal distance from previous prime (31384438903) and next prime (31384438907).

It is not a de Polignac number, because 31384438905 - 2¹ = 31384438903 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31384438903) by changing a digit.

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 in 95 ways as a sum of consecutive naturals, for example, 21809176 + ... + 21810614.

It is an arithmetic number, because the mean of its divisors is an integer number (579117600).

Almost surely, 2^31384438905 is an apocalyptic number.

It is an amenable number.

31384438905 is a deficient number, since it is larger than the sum of its proper divisors (24210850695).

31384438905 is a wasteful number, since it uses less digits than its factorization.

31384438905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1615 (or 1584 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 48.

The spelling of 31384438905 in words is "thirty-one billion, three hundred eighty-four million, four hundred thirty-eight thousand, nine hundred five".