31355438138 has 32 divisors (see below), whose sum is σ = 49069787904. Its totient is φ = 15012689472.

The previous prime is 31355438099. The next prime is 31355438141. The reversal of 31355438138 is 83183455313.

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 in 15 ways as a sum of consecutive naturals, for example, 7370420 + ... + 7374672.

It is an arithmetic number, because the mean of its divisors is an integer number (1533430872).

Almost surely, 2^31355438138 is an apocalyptic number.

31355438138 is a deficient number, since it is larger than the sum of its proper divisors (17714349766).

31355438138 is a wasteful number, since it uses less digits than its factorization.

31355438138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5846.

The product of its digits is 518400, while the sum is 44.

The spelling of 31355438138 in words is "thirty-one billion, three hundred fifty-five million, four hundred thirty-eight thousand, one hundred thirty-eight".