831639913 has 8 divisors (see below), whose sum is σ = 897640128. Its totient is φ = 765929424.

The previous prime is 831639841. The next prime is 831639923. The reversal of 831639913 is 319936138.

It is a happy number.

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

It is not a de Polignac number, because 831639913 - 2¹⁷ = 831508841 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 831639913.

It is not an unprimeable number, because it can be changed into a prime (831639923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66445 + ... + 77962.

It is an arithmetic number, because the mean of its divisors is an integer number (112205016).

Almost surely, 2^831639913 is an apocalyptic number.

It is an amenable number.

831639913 is a deficient number, since it is larger than the sum of its proper divisors (66000215).

831639913 is a wasteful number, since it uses less digits than its factorization.

831639913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144863.

The product of its digits is 104976, while the sum is 43.

The square root of 831639913 is about 28838.1676428999. The cubic root of 831639913 is about 940.3981688013.

The spelling of 831639913 in words is "eight hundred thirty-one million, six hundred thirty-nine thousand, nine hundred thirteen".