1218089 has 2 divisors, whose sum is σ = 1218090. Its totient is φ = 1218088.

The previous prime is 1218043. The next prime is 1218121. The reversal of 1218089 is 9808121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1000000 + 218089 = 1000^2 + 467^2 .

It is a cyclic number.

It is not a de Polignac number, because 1218089 - 2⁸ = 1217833 is a prime.

It is not a weakly prime, because it can be changed into another prime (1218989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609044 + 609045.

It is an arithmetic number, because the mean of its divisors is an integer number (609045).

2^1218089 is an apocalyptic number.

It is an amenable number.

1218089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218089 is an equidigital number, since it uses as much as digits as its factorization.

1218089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 1218089 is about 1103.6706936401. The cubic root of 1218089 is about 106.7971525937.

The spelling of 1218089 in words is "one million, two hundred eighteen thousand, eighty-nine".