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12111311 is a prime number
BaseRepresentation
bin101110001100…
…110111001111
3211210022121002
4232030313033
511100030221
61111330515
7204641642
oct56146717
924708532
1012111311
116922453
124080a3b
132680874
141873a59
1510e380b
hexb8cdcf

12111311 has 2 divisors, whose sum is σ = 12111312. Its totient is φ = 12111310.

The previous prime is 12111301. The next prime is 12111313. The reversal of 12111311 is 11311121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-12111311 is a prime.

It is a Sophie Germain prime.

Together with 12111313, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12111292 and 12111301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12111313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055655 + 6055656.

It is an arithmetic number, because the mean of its divisors is an integer number (6055656).

Almost surely, 212111311 is an apocalyptic number.

12111311 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111311 is an equidigital number, since it uses as much as digits as its factorization.

12111311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6, while the sum is 11.

The square root of 12111311 is about 3480.1308883431. The cubic root of 12111311 is about 229.6485558882.

Adding to 12111311 its reverse (11311121), we get a palindrome (23422432).

It can be divided in two parts, 121 and 11311, that multiplied together give a palindrome (1368631).

The spelling of 12111311 in words is "twelve million, one hundred eleven thousand, three hundred eleven".