99191 has 2 divisors, whose sum is σ = 99192.
Its totient is φ = 99190.
The previous prime is 99181. The next prime is 99223. The reversal of 99191 is 19199.
It is a weak prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-99191 is a prime.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (99131) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49595 + 49596.
It is an arithmetic number, because the mean of its divisors is an integer number (49596).
299191 is an apocalyptic number.
99191 is a deficient number, since it is larger than the sum of its proper divisors (1).
99191 is an equidigital number, since it uses as much as digits as its factorization.
99191 is an evil number, because the sum of its binary digits is even.
The product of its digits is 729, while the sum is 29.
The square root of 99191 is about 314.9460271221.
The cubic root of 99191 is about 46.2903810951.
The spelling of 99191 in words is "ninety-nine thousand, one hundred ninety-one".