831686138 has 8 divisors (see below), whose sum is σ = 1320913332. Its totient is φ = 391381696.

The previous prime is 831686117. The next prime is 831686159.

831686138 is nontrivially palindromic in base 10.

831686138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (831686117) and next prime (831686159).

It can be written as a sum of positive squares in 2 ways, for example, as 831572569 + 113569 = 28837^2 + 337^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12230645 + ... + 12230712.

Almost surely, 2^831686138 is an apocalyptic number.

831686138 is a deficient number, since it is larger than the sum of its proper divisors (489227194).

831686138 is a wasteful number, since it uses less digits than its factorization.

831686138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24461376.

The product of its digits is 165888, while the sum is 44.

The square root of 831686138 is about 28838.9690869837. The cubic root of 831686138 is about 940.4155918468.

The spelling of 831686138 in words is "eight hundred thirty-one million, six hundred eighty-six thousand, one hundred thirty-eight".