91191617 has 8 divisors (see below), whose sum is σ = 99597600. Its totient is φ = 82804960.

The previous prime is 91191599. The next prime is 91191629. The reversal of 91191617 is 71619119.

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 91191617 - 2⁸ = 91191361 is a prime.

It is a super-2 number, since 2×91191617² = 16631822022149378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91191637) 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, 6134 + ... + 14832.

It is an arithmetic number, because the mean of its divisors is an integer number (12449700).

Almost surely, 2^91191617 is an apocalyptic number.

It is an amenable number.

91191617 is a deficient number, since it is larger than the sum of its proper divisors (8405983).

91191617 is a wasteful number, since it uses less digits than its factorization.

91191617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9663.

The product of its digits is 3402, while the sum is 35.

The square root of 91191617 is about 9549.4301924251. The cubic root of 91191617 is about 450.1096309023.

The spelling of 91191617 in words is "ninety-one million, one hundred ninety-one thousand, six hundred seventeen".