9391 has 2 divisors, whose sum is σ = 9392. Its totient is φ = 9390.

The previous prime is 9377. The next prime is 9397. The reversal of 9391 is 1939.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9391 is a prime.

It is a plaindrome in base 8 and base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9397) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4695 + 4696.

It is an arithmetic number, because the mean of its divisors is an integer number (4696).

2⁹³⁹¹ is an apocalyptic number.

9391 is a deficient number, since it is larger than the sum of its proper divisors (1).

9391 is an equidigital number, since it uses as much as digits as its factorization.

9391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 243, while the sum is 22.

The square root of 9391 is about 96.9071720772. The cubic root of 9391 is about 21.0978053017.

Multiplying 9391 by its sum of digits (22), we get a palindrome (206602).

It can be divided in two parts, 9 and 391, that added together give a square (400 = 20²).

The spelling of 9391 in words is "nine thousand, three hundred ninety-one".