9191 has 8 divisors (see below), whose sum is σ = 11424. Its totient is φ = 7200.

The previous prime is 9187. The next prime is 9199. The reversal of 9191 is 1919.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9191 - 2² = 9187 is a prime.

9191 is an undulating number in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9199) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41 + ... + 141.

It is an arithmetic number, because the mean of its divisors is an integer number (1428).

2⁹¹⁹¹ is an apocalyptic number.

9191 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

9191 is a deficient number, since it is larger than the sum of its proper divisors (2233).

9191 is a wasteful number, since it uses less digits than its factorization.

9191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121.

The product of its digits is 81, while the sum is 20.

The square root of 9191 is about 95.8697032435. The cubic root of 9191 is about 20.9469560762.

The spelling of 9191 in words is "nine thousand, one hundred ninety-one".