831491 has 8 divisors (see below), whose sum is σ = 867504. Its totient is φ = 796320.

The previous prime is 831461. The next prime is 831503. The reversal of 831491 is 194138.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-831491 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 831491.

It is not an unprimeable number, because it can be changed into a prime (831431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2465 + ... + 2781.

It is an arithmetic number, because the mean of its divisors is an integer number (108438).

2⁸³¹⁴⁹¹ is an apocalyptic number.

831491 is a deficient number, since it is larger than the sum of its proper divisors (36013).

831491 is a wasteful number, since it uses less digits than its factorization.

831491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421.

The product of its digits is 864, while the sum is 26.

The square root of 831491 is about 911.8612833101. The cubic root of 831491 is about 94.0342036386.

It can be divided in two parts, 83 and 1491, that multiplied together give a triangular number (123753 = T₄₉₇).

The spelling of 831491 in words is "eight hundred thirty-one thousand, four hundred ninety-one".