831721127138 has 16 divisors (see below), whose sum is σ = 1361094023520. Its totient is φ = 378028442400.

The previous prime is 831721127117. The next prime is 831721127147.

831721127138 is nontrivially palindromic in base 10.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1009448 + ... + 1637811.

It is an arithmetic number, because the mean of its divisors is an integer number (85068376470).

Almost surely, 2^831721127138 is an apocalyptic number.

831721127138 is a deficient number, since it is larger than the sum of its proper divisors (529372896382).

831721127138 is a wasteful number, since it uses less digits than its factorization.

831721127138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2661553.

The product of its digits is 112896, while the sum is 44.

It can be divided in two parts, 831721 and 127138, that added together give a palindrome (958859).

The spelling of 831721127138 in words is "eight hundred thirty-one billion, seven hundred twenty-one million, one hundred twenty-seven thousand, one hundred thirty-eight".