491931 has 12 divisors (see below), whose sum is σ = 775320. Its totient is φ = 298080.

The previous prime is 491923. The next prime is 491951. The reversal of 491931 is 139194.

It is not a de Polignac number, because 491931 - 2³ = 491923 is a prime.

It is a super-3 number, since 3×491931³ = 357136163336722473, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 491895 and 491904.

It is not an unprimeable number, because it can be changed into a prime (491951) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2386 + ... + 2583.

It is an arithmetic number, because the mean of its divisors is an integer number (64610).

2⁴⁹¹⁹³¹ is an apocalyptic number.

491931 is a deficient number, since it is larger than the sum of its proper divisors (283389).

491931 is a wasteful number, since it uses less digits than its factorization.

491931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4986 (or 4983 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 491931 is about 701.3779295073. The cubic root of 491931 is about 78.9407770637.

It can be divided in two parts, 49193 and 1, that added together give a palindrome (49194).

The spelling of 491931 in words is "four hundred ninety-one thousand, nine hundred thirty-one".