491331 has 8 divisors (see below), whose sum is σ = 659200. Its totient is φ = 325512.

The previous prime is 491329. The next prime is 491333. The reversal of 491331 is 133194.

It is an interprime number because it is at equal distance from previous prime (491329) and next prime (491333).

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

It is not a de Polignac number, because 491331 - 2¹ = 491329 is a prime.

It is a super-2 number, since 2×491331² = 482812303122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 491298 and 491307.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 491331.

It is not an unprimeable number, because it can be changed into a prime (491333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186 + ... + 1008.

It is an arithmetic number, because the mean of its divisors is an integer number (82400).

2⁴⁹¹³³¹ is an apocalyptic number.

491331 is a deficient number, since it is larger than the sum of its proper divisors (167869).

491331 is a wasteful number, since it uses less digits than its factorization.

491331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025.

The product of its digits is 324, while the sum is 21.

The square root of 491331 is about 700.9500695485. The cubic root of 491331 is about 78.9086697588.

The spelling of 491331 in words is "four hundred ninety-one thousand, three hundred thirty-one".