91217 has 8 divisors (see below), whose sum is σ = 106176. Its totient is φ = 76752.

The previous prime is 91199. The next prime is 91229. The reversal of 91217 is 71219.

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 91217 - 2⁶ = 91153 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 91217.

It is not an unprimeable number, because it can be changed into a prime (91237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 503 + ... + 659.

It is an arithmetic number, because the mean of its divisors is an integer number (13272).

2⁹¹²¹⁷ is an apocalyptic number.

It is an amenable number.

91217 is a deficient number, since it is larger than the sum of its proper divisors (14959).

91217 is a wasteful number, since it uses less digits than its factorization.

91217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247.

The product of its digits is 126, while the sum is 20.

The square root of 91217 is about 302.0215224119. The cubic root of 91217 is about 45.0151389393.

It can be divided in two parts, 912 and 17, that added together give a palindrome (929).

The spelling of 91217 in words is "ninety-one thousand, two hundred seventeen".