831672509 has 4 divisors (see below), whose sum is σ = 832239360. Its totient is φ = 831105660.

The previous prime is 831672497. The next prime is 831672529. The reversal of 831672509 is 905276138.

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 831672509 - 2⁸ = 831672253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (831672529) 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, 281219 + ... + 284160.

It is an arithmetic number, because the mean of its divisors is an integer number (208059840).

Almost surely, 2^831672509 is an apocalyptic number.

It is an amenable number.

831672509 is a deficient number, since it is larger than the sum of its proper divisors (566851).

831672509 is a wasteful number, since it uses less digits than its factorization.

831672509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566850.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 831672509 is about 28838.7327911613. The cubic root of 831672509 is about 940.4104548953.

The spelling of 831672509 in words is "eight hundred thirty-one million, six hundred seventy-two thousand, five hundred nine".