1188289 has 2 divisors, whose sum is σ = 1188290. Its totient is φ = 1188288.

The previous prime is 1188287. The next prime is 1188293. The reversal of 1188289 is 9828811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1016064 + 172225 = 1008^2 + 415^2 .

It is a cyclic number.

It is not a de Polignac number, because 1188289 - 2¹ = 1188287 is a prime.

Together with 1188287, it forms a pair of twin primes.

1188289 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1188287) 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, 594144 + 594145.

It is an arithmetic number, because the mean of its divisors is an integer number (594145).

2^1188289 is an apocalyptic number.

It is an amenable number.

1188289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1188289 is an equidigital number, since it uses as much as digits as its factorization.

1188289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 37.

The square root of 1188289 is about 1090.0866938001. The cubic root of 1188289 is about 105.9190375004.

It can be divided in two parts, 11 and 88289, that multiplied together give a palindrome (971179).

The spelling of 1188289 in words is "one million, one hundred eighty-eight thousand, two hundred eighty-nine".