10391 has 2 divisors, whose sum is σ = 10392.
Its totient is φ = 10390.
The previous prime is 10369. The next prime is 10399. The reversal of 10391 is 19301.
10391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a strong prime.
It is an emirp because it is prime and its reverse (19301) is a distict prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-10391 is a prime.
It is a Chen prime.
It is an Ulam number.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (10399) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5195 + 5196.
It is an arithmetic number, because the mean of its divisors is an integer number (5196).
210391 is an apocalyptic number.
10391 is a deficient number, since it is larger than the sum of its proper divisors (1).
10391 is an equidigital number, since it uses as much as digits as its factorization.
10391 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 27, while the sum is 14.
The square root of 10391 is about 101.9362545908.
The cubic root of 10391 is about 21.8215593466.
Adding to 10391 its reverse (19301), we get a palindrome (29692).
The spelling of 10391 in words is "ten thousand, three hundred ninety-one".