9091 has 2 divisors, whose sum is σ = 9092.
Its totient is φ = 9090.
The previous prime is 9067. The next prime is 9103. The reversal of 9091 is 1909.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 9091 - 25 = 9059 is a prime.
It is a plaindrome in base 14.
It is not a weakly prime, because it can be changed into another prime (9001) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4545 + 4546.
It is an arithmetic number, because the mean of its divisors is an integer number (4546).
29091 is an apocalyptic number.
9091 is a deficient number, since it is larger than the sum of its proper divisors (1).
9091 is an equidigital number, since it uses as much as digits as its factorization.
9091 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 81, while the sum is 19.
The square root of 9091 is about 95.3467356547.
The cubic root of 9091 is about 20.8707097928.
It can be divided in two parts, 90 and 91, that added together give a palindrome (181).
The spelling of 9091 in words is "nine thousand, ninety-one".