1181209 has 2 divisors, whose sum is σ = 1181210. Its totient is φ = 1181208.

The previous prime is 1181203. The next prime is 1181237. The reversal of 1181209 is 9021811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 595984 + 585225 = 772^2 + 765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1181209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1181209.

It is not a weakly prime, because it can be changed into another prime (1181203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 590604 + 590605.

It is an arithmetic number, because the mean of its divisors is an integer number (590605).

2^1181209 is an apocalyptic number.

It is an amenable number.

1181209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1181209 is an equidigital number, since it uses as much as digits as its factorization.

1181209 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 22.

The square root of 1181209 is about 1086.8343940086. The cubic root of 1181209 is about 105.7082579436.

The spelling of 1181209 in words is "one million, one hundred eighty-one thousand, two hundred nine".