91688527 has 4 divisors (see below), whose sum is σ = 104786896. Its totient is φ = 78590160.

The previous prime is 91688521. The next prime is 91688533. The reversal of 91688527 is 72588619.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72588619 = 401 ⋅181019.

It is an interprime number because it is at equal distance from previous prime (91688521) and next prime (91688533).

It is a cyclic number.

It is not a de Polignac number, because 91688527 - 2¹⁹ = 91164239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91688521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6549174 + ... + 6549187.

It is an arithmetic number, because the mean of its divisors is an integer number (26196724).

Almost surely, 2^91688527 is an apocalyptic number.

91688527 is a deficient number, since it is larger than the sum of its proper divisors (13098369).

91688527 is a wasteful number, since it uses less digits than its factorization.

91688527 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13098368.

The product of its digits is 241920, while the sum is 46.

The square root of 91688527 is about 9575.4126281848. The cubic root of 91688527 is about 450.9257108427.

The spelling of 91688527 in words is "ninety-one million, six hundred eighty-eight thousand, five hundred twenty-seven".