11111209 has 2 divisors, whose sum is σ = 11111210. Its totient is φ = 11111208.

The previous prime is 11111173. The next prime is 11111267. The reversal of 11111209 is 90211111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9000000 + 2111209 = 3000^2 + 1453^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11111209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11111192 and 11111201.

It is not a weakly prime, because it can be changed into another prime (11111509) 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, 5555604 + 5555605.

It is an arithmetic number, because the mean of its divisors is an integer number (5555605).

Almost surely, 2^11111209 is an apocalyptic number.

It is an amenable number.

11111209 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111209 is an equidigital number, since it uses as much as digits as its factorization.

11111209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 16.

The square root of 11111209 is about 3333.3480166343. The cubic root of 11111209 is about 223.1449719926.

The spelling of 11111209 in words is "eleven million, one hundred eleven thousand, two hundred nine".