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BaseRepresentation
bin111100010111111
31120101212
413202333
51442121
6355035
7156056
oct74277
946355
1030911
1121251
1215a7b
13110ba
14b39d
15925b
hex78bf

30911 has 2 divisors, whose sum is σ = 30912. Its totient is φ = 30910.

The previous prime is 30893. The next prime is 30931. The reversal of 30911 is 11903.

It is a weak prime.

It is an emirp because it is prime and its reverse (11903) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-30911 is a prime.

It is a Chen prime.

It is a plaindrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 30911.

It is not a weakly prime, because it can be changed into another prime (30931) 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, 15455 + 15456.

It is an arithmetic number, because the mean of its divisors is an integer number (15456).

230911 is an apocalyptic number.

30911 is a deficient number, since it is larger than the sum of its proper divisors (1).

30911 is an equidigital number, since it uses as much as digits as its factorization.

30911 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 30911 is about 175.8152439352. The cubic root of 30911 is about 31.3837150332.

The spelling of 30911 in words is "thirty thousand, nine hundred eleven".