831668421 has 16 divisors (see below), whose sum is σ = 1142527680. Its totient is φ = 537863040.

The previous prime is 831668419. The next prime is 831668479. The reversal of 831668421 is 124866138.

It is not a de Polignac number, because 831668421 - 2¹ = 831668419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 831668421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (831668021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15235 + ... + 43536.

It is an arithmetic number, because the mean of its divisors is an integer number (71407980).

Almost surely, 2^831668421 is an apocalyptic number.

It is an amenable number.

831668421 is a deficient number, since it is larger than the sum of its proper divisors (310859259).

831668421 is a wasteful number, since it uses less digits than its factorization.

831668421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58916.

The product of its digits is 55296, while the sum is 39.

The square root of 831668421 is about 28838.6619141735. The cubic root of 831668421 is about 940.4089140627.

The spelling of 831668421 in words is "eight hundred thirty-one million, six hundred sixty-eight thousand, four hundred twenty-one".