91816717 has 4 divisors (see below), whose sum is σ = 91953820. Its totient is φ = 91679616.

The previous prime is 91816687. The next prime is 91816729. The reversal of 91816717 is 71761819.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71761819 = 6037 ⋅11887.

It can be written as a sum of positive squares in 2 ways, for example, as 48177481 + 43639236 = 6941^2 + 6606^2 .

It is a cyclic number.

It is not a de Polignac number, because 91816717 - 2¹⁵ = 91783949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91816717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91816757) 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, 67542 + ... + 68887.

It is an arithmetic number, because the mean of its divisors is an integer number (22988455).

Almost surely, 2^91816717 is an apocalyptic number.

It is an amenable number.

91816717 is a deficient number, since it is larger than the sum of its proper divisors (137103).

91816717 is a wasteful number, since it uses less digits than its factorization.

91816717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137102.

The product of its digits is 21168, while the sum is 40.

The square root of 91816717 is about 9582.1039965135. The cubic root of 91816717 is about 451.1357598385.

The spelling of 91816717 in words is "ninety-one million, eight hundred sixteen thousand, seven hundred seventeen".