30491 has 2 divisors, whose sum is σ = 30492. Its totient is φ = 30490.

The previous prime is 30469. The next prime is 30493. The reversal of 30491 is 19403.

It is a strong prime.

It is an emirp because it is prime and its reverse (19403) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30491 - 2⁶ = 30427 is a prime.

Together with 30493, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 12.

It is not a weakly prime, because it can be changed into another prime (30493) 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, 15245 + 15246.

It is an arithmetic number, because the mean of its divisors is an integer number (15246).

2³⁰⁴⁹¹ is an apocalyptic number.

30491 is a deficient number, since it is larger than the sum of its proper divisors (1).

30491 is an equidigital number, since it uses as much as digits as its factorization.

30491 is an evil number, because the sum of its binary digits is even.

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

The square root of 30491 is about 174.6167231396. The cubic root of 30491 is about 31.2409253651.

Adding to 30491 its reverse (19403), we get a palindrome (49894).

The spelling of 30491 in words is "thirty thousand, four hundred ninety-one".