831609 has 6 divisors (see below), whose sum is σ = 1201226. Its totient is φ = 554400.

The previous prime is 831599. The next prime is 831617. The reversal of 831609 is 906138.

831609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 810000 + 21609 = 900^2 + 147^2 .

It is not a de Polignac number, because 831609 - 2¹¹ = 829561 is a prime.

It is a Duffinian number.

It is a Curzon number.

831609 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (831619) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46192 + ... + 46209.

2⁸³¹⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

831609 is a deficient number, since it is larger than the sum of its proper divisors (369617).

831609 is a wasteful number, since it uses less digits than its factorization.

831609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92407 (or 92404 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 831609 is about 911.9259838386. The cubic root of 831609 is about 94.0386516768.

Subtracting 831609 from its reverse (906138), we obtain a square (74529 = 273²).

The spelling of 831609 in words is "eight hundred thirty-one thousand, six hundred nine".