91688917 has 8 divisors (see below), whose sum is σ = 96200192. Its totient is φ = 87274800.

The previous prime is 91688899. The next prime is 91688921. The reversal of 91688917 is 71988619.

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 91688917 - 2¹¹ = 91686869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91688017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22353 + ... + 26134.

It is an arithmetic number, because the mean of its divisors is an integer number (12025024).

Almost surely, 2^91688917 is an apocalyptic number.

It is an amenable number.

91688917 is a deficient number, since it is larger than the sum of its proper divisors (4511275).

91688917 is a wasteful number, since it uses less digits than its factorization.

91688917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48579.

The product of its digits is 217728, while the sum is 49.

The square root of 91688917 is about 9575.4329928207. The cubic root of 91688917 is about 450.9263501840.

The spelling of 91688917 in words is "ninety-one million, six hundred eighty-eight thousand, nine hundred seventeen".