831297309 has 4 divisors (see below), whose sum is σ = 1108396416. Its totient is φ = 554198204.

The previous prime is 831297293. The next prime is 831297317. The reversal of 831297309 is 903792138.

831297309 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 831297309 - 2⁴ = 831297293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (831297359) 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, 138549549 + ... + 138549554.

It is an arithmetic number, because the mean of its divisors is an integer number (277099104).

Almost surely, 2^831297309 is an apocalyptic number.

It is an amenable number.

831297309 is a deficient number, since it is larger than the sum of its proper divisors (277099107).

831297309 is a wasteful number, since it uses less digits than its factorization.

831297309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277099106.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 831297309 is about 28832.2269171148. The cubic root of 831297309 is about 940.2690149765.

The spelling of 831297309 in words is "eight hundred thirty-one million, two hundred ninety-seven thousand, three hundred nine".