91716805 has 4 divisors (see below), whose sum is σ = 110060172. Its totient is φ = 73373440.

The previous prime is 91716803. The next prime is 91716809. The reversal of 91716805 is 50861719.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15992001 + 75724804 = 3999^2 + 8702^2 .

It is not a de Polignac number, because 91716805 - 2¹ = 91716803 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 (91716803) 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 3 ways as a sum of consecutive naturals, for example, 9171676 + ... + 9171685.

It is an arithmetic number, because the mean of its divisors is an integer number (27515043).

Almost surely, 2^91716805 is an apocalyptic number.

It is an amenable number.

91716805 is a deficient number, since it is larger than the sum of its proper divisors (18343367).

91716805 is a wasteful number, since it uses less digits than its factorization.

91716805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18343366.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 91716805 is about 9576.8891086824. The cubic root of 91716805 is about 450.9720633036.

The spelling of 91716805 in words is "ninety-one million, seven hundred sixteen thousand, eight hundred five".