11911321 has 2 divisors, whose sum is σ = 11911322. Its totient is φ = 11911320.

The previous prime is 11911313. The next prime is 11911343. The reversal of 11911321 is 12311911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10497600 + 1413721 = 3240^2 + 1189^2 .

It is an emirp because it is prime and its reverse (12311911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11911321 - 2³ = 11911313 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11911121) 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, 5955660 + 5955661.

It is an arithmetic number, because the mean of its divisors is an integer number (5955661).

Almost surely, 2^11911321 is an apocalyptic number.

It is an amenable number.

11911321 is a deficient number, since it is larger than the sum of its proper divisors (1).

11911321 is an equidigital number, since it uses as much as digits as its factorization.

11911321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54, while the sum is 19.

The square root of 11911321 is about 3451.2781690267. The cubic root of 11911321 is about 228.3774973920.

The spelling of 11911321 in words is "eleven million, nine hundred eleven thousand, three hundred twenty-one".