8491217 has 8 divisors (see below), whose sum is σ = 9799296. Its totient is φ = 7206912.

The previous prime is 8491207. The next prime is 8491237. The reversal of 8491217 is 7121948.

8491217 is nontrivially palindromic in base 6.

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

It is a cyclic number.

It is not a de Polignac number, because 8491217 - 2¹² = 8487121 is a prime.

It is a super-2 number, since 2×8491217² = 144201532282178, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8491207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5168 + ... + 6609.

It is an arithmetic number, because the mean of its divisors is an integer number (1224912).

Almost surely, 2^8491217 is an apocalyptic number.

It is an amenable number.

8491217 is a deficient number, since it is larger than the sum of its proper divisors (1308079).

8491217 is a wasteful number, since it uses less digits than its factorization.

8491217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11887.

The product of its digits is 4032, while the sum is 32.

The square root of 8491217 is about 2913.9692860427. The cubic root of 8491217 is about 204.0124383676.

The spelling of 8491217 in words is "eight million, four hundred ninety-one thousand, two hundred seventeen".