22391 has 2 divisors, whose sum is σ = 22392. Its totient is φ = 22390.

The previous prime is 22381. The next prime is 22397. The reversal of 22391 is 19322.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22391 - 2¹⁴ = 6007 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11195 + 11196.

It is an arithmetic number, because the mean of its divisors is an integer number (11196).

2²²³⁹¹ is an apocalyptic number.

22391 is a deficient number, since it is larger than the sum of its proper divisors (1).

22391 is an equidigital number, since it uses as much as digits as its factorization.

22391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108, while the sum is 17.

The square root of 22391 is about 149.6362255605. The cubic root of 22391 is about 28.1854190839.

The spelling of 22391 in words is "twenty-two thousand, three hundred ninety-one".