91169 has 4 divisors (see below), whose sum is σ = 98196. Its totient is φ = 84144.

The previous prime is 91163. The next prime is 91183. The reversal of 91169 is 96119.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96119 = 277 ⋅347.

It can be written as a sum of positive squares in 2 ways, for example, as 44944 + 46225 = 212^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 91169 - 2⁴ = 91153 is a prime.

It is a super-3 number, since 3×91169³ = 2273331806939427, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91163) 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, 3494 + ... + 3519.

It is an arithmetic number, because the mean of its divisors is an integer number (24549).

2⁹¹¹⁶⁹ is an apocalyptic number.

It is an amenable number.

91169 is a deficient number, since it is larger than the sum of its proper divisors (7027).

91169 is a wasteful number, since it uses less digits than its factorization.

91169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7026.

The product of its digits is 486, while the sum is 26.

The square root of 91169 is about 301.9420474197. The cubic root of 91169 is about 45.0072416329.

Subtracting 91169 from its reverse (96119), we obtain a triangular number (4950 = T₉₉).

The spelling of 91169 in words is "ninety-one thousand, one hundred sixty-nine".