11809211 has 2 divisors, whose sum is σ = 11809212. Its totient is φ = 11809210.

The previous prime is 11809199. The next prime is 11809249. The reversal of 11809211 is 11290811.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11809211 - 2¹⁴ = 11792827 is a prime.

It is not a weakly prime, because it can be changed into another prime (11809111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5904605 + 5904606.

It is an arithmetic number, because the mean of its divisors is an integer number (5904606).

Almost surely, 2^11809211 is an apocalyptic number.

11809211 is a deficient number, since it is larger than the sum of its proper divisors (1).

11809211 is an equidigital number, since it uses as much as digits as its factorization.

11809211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 23.

The square root of 11809211 is about 3436.4532588121. The cubic root of 11809211 is about 227.7230336987.

Subtracting from 11809211 its reverse (11290811), we obtain a square (518400 = 720²).

The spelling of 11809211 in words is "eleven million, eight hundred nine thousand, two hundred eleven".