9491 has 2 divisors, whose sum is σ = 9492. Its totient is φ = 9490.

The previous prime is 9479. The next prime is 9497. The reversal of 9491 is 1949.

It is a strong prime.

It is an emirp because it is prime and its reverse (1949) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9491 - 2¹⁰ = 8467 is a prime.

It is a Chen prime.

It is a plaindrome in base 12.

It is a nialpdrome in base 13.

It is not a weakly prime, because it can be changed into another prime (9497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4745 + 4746.

It is an arithmetic number, because the mean of its divisors is an integer number (4746).

2⁹⁴⁹¹ is an apocalyptic number.

9491 is a deficient number, since it is larger than the sum of its proper divisors (1).

9491 is an equidigital number, since it uses as much as digits as its factorization.

9491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 23.

The square root of 9491 is about 97.4217634823. The cubic root of 9491 is about 21.1724276656.

The spelling of 9491 in words is "nine thousand, four hundred ninety-one".