30391 has 2 divisors, whose sum is σ = 30392. Its totient is φ = 30390.

The previous prime is 30389. The next prime is 30403. The reversal of 30391 is 19303.

It is a happy number.

30391 is nontrivially palindromic in base 2.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30391 - 2¹ = 30389 is a prime.

It is a super-2 number, since 2×30391² = 1847225762, which contains 22 as substring.

Together with 30389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30341) 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, 15195 + 15196.

It is an arithmetic number, because the mean of its divisors is an integer number (15196).

2³⁰³⁹¹ is an apocalyptic number.

30391 is a deficient number, since it is larger than the sum of its proper divisors (1).

30391 is an equidigital number, since it uses as much as digits as its factorization.

30391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81, while the sum is 16.

The square root of 30391 is about 174.3301465611. The cubic root of 30391 is about 31.2067347942.

Adding to 30391 its reverse (19303), we get a palindrome (49694).

The spelling of 30391 in words is "thirty thousand, three hundred ninety-one".