831641009 has 4 divisors (see below), whose sum is σ = 840985380. Its totient is φ = 822296640.

The previous prime is 831640991. The next prime is 831641021. The reversal of 831641009 is 900146138.

It is a happy number.

831641009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 179962225 + 651678784 = 13415^2 + 25528^2 .

It is a cyclic number.

It is not a de Polignac number, because 831641009 - 2¹² = 831636913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (831641029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4672052 + ... + 4672229.

It is an arithmetic number, because the mean of its divisors is an integer number (210246345).

Almost surely, 2^831641009 is an apocalyptic number.

831641009 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

It is an amenable number.

831641009 is a deficient number, since it is larger than the sum of its proper divisors (9344371).

831641009 is an equidigital number, since it uses as much as digits as its factorization.

831641009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9344370.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 831641009 is about 28838.1866454880. The cubic root of 831641009 is about 940.3985819112.

The spelling of 831641009 in words is "eight hundred thirty-one million, six hundred forty-one thousand, nine".