11656321 has 2 divisors, whose sum is σ = 11656322. Its totient is φ = 11656320.

The previous prime is 11656319. The next prime is 11656349. The reversal of 11656321 is 12365611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11296321 + 360000 = 3361^2 + 600^2 .

It is an emirp because it is prime and its reverse (12365611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11656321 - 2¹ = 11656319 is a prime.

Together with 11656319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11656361) 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, 5828160 + 5828161.

It is an arithmetic number, because the mean of its divisors is an integer number (5828161).

Almost surely, 2^11656321 is an apocalyptic number.

It is an amenable number.

11656321 is a deficient number, since it is larger than the sum of its proper divisors (1).

11656321 is an equidigital number, since it uses as much as digits as its factorization.

11656321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 25.

The square root of 11656321 is about 3414.1354688999. The cubic root of 11656321 is about 226.7360098778.

The spelling of 11656321 in words is "eleven million, six hundred fifty-six thousand, three hundred twenty-one".