491217 has 8 divisors (see below), whose sum is σ = 664224. Its totient is φ = 322848.

The previous prime is 491213. The next prime is 491219. The reversal of 491217 is 712194.

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

It is not a de Polignac number, because 491217 - 2² = 491213 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (491213) 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, 903 + ... + 1340.

It is an arithmetic number, because the mean of its divisors is an integer number (83028).

2⁴⁹¹²¹⁷ is an apocalyptic number.

It is an amenable number.

491217 is a deficient number, since it is larger than the sum of its proper divisors (173007).

491217 is a wasteful number, since it uses less digits than its factorization.

491217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2319.

The product of its digits is 504, while the sum is 24.

The square root of 491217 is about 700.8687466281. The cubic root of 491217 is about 78.9025664163.

The spelling of 491217 in words is "four hundred ninety-one thousand, two hundred seventeen".