491381 has 12 divisors (see below), whose sum is σ = 561792. Its totient is φ = 429000.

The previous prime is 491377. The next prime is 491417. The reversal of 491381 is 183194.

It is not a de Polignac number, because 491381 - 2² = 491377 is a prime.

It is a super-2 number, since 2×491381² = 482910574322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 491381.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 491381.

It is not an unprimeable number, because it can be changed into a prime (491341) 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, 3686 + ... + 3816.

It is an arithmetic number, because the mean of its divisors is an integer number (46816).

2⁴⁹¹³⁸¹ is an apocalyptic number.

It is an amenable number.

491381 is a deficient number, since it is larger than the sum of its proper divisors (70411).

491381 is a wasteful number, since it uses less digits than its factorization.

491381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184 (or 173 counting only the distinct ones).

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

The square root of 491381 is about 700.9857345196. The cubic root of 491381 is about 78.9113463656.

It can be divided in two parts, 4913 and 81, that added together give a palindrome (4994).

The spelling of 491381 in words is "four hundred ninety-one thousand, three hundred eighty-one".