491109 has 8 divisors (see below), whose sum is σ = 660480. Its totient is φ = 324576.

The previous prime is 491083. The next prime is 491129. The reversal of 491109 is 901194.

491109 is nontrivially palindromic in base 15.

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

It is not a de Polignac number, because 491109 - 2¹¹ = 489061 is a prime.

491109 is a lucky number.

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 491109.

It is not an unprimeable number, because it can be changed into a prime (491129) 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, 264 + ... + 1025.

It is an arithmetic number, because the mean of its divisors is an integer number (82560).

2⁴⁹¹¹⁰⁹ is an apocalyptic number.

It is an amenable number.

491109 is a deficient number, since it is larger than the sum of its proper divisors (169371).

491109 is a wasteful number, since it uses less digits than its factorization.

491109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1419.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 491109 is about 700.7916951563. The cubic root of 491109 is about 78.8967834312.

The spelling of 491109 in words is "four hundred ninety-one thousand, one hundred nine".