91171711 has 4 divisors (see below), whose sum is σ = 91243624. Its totient is φ = 91099800.

The previous prime is 91171693. The next prime is 91171721. The reversal of 91171711 is 11717119.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11717119 = 383 ⋅30593.

It is a cyclic number.

It is not a de Polignac number, because 91171711 - 2¹³ = 91163519 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 91171711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91171721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34020 + ... + 36601.

It is an arithmetic number, because the mean of its divisors is an integer number (22810906).

Almost surely, 2^91171711 is an apocalyptic number.

91171711 is a deficient number, since it is larger than the sum of its proper divisors (71913).

91171711 is a wasteful number, since it uses less digits than its factorization.

91171711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71912.

The product of its digits is 441, while the sum is 28.

The square root of 91171711 is about 9548.3878744006. The cubic root of 91171711 is about 450.0768774006.

The spelling of 91171711 in words is "ninety-one million, one hundred seventy-one thousand, seven hundred eleven".