1229209 has 2 divisors, whose sum is σ = 1229210. Its totient is φ = 1229208.

The previous prime is 1229203. The next prime is 1229213. The reversal of 1229209 is 9029221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1177225 + 51984 = 1085^2 + 228^2 .

It is a cyclic number.

It is not a de Polignac number, because 1229209 - 2³ = 1229201 is a prime.

It is not a weakly prime, because it can be changed into another prime (1229201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614604 + 614605.

It is an arithmetic number, because the mean of its divisors is an integer number (614605).

2^1229209 is an apocalyptic number.

It is an amenable number.

1229209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1229209 is an equidigital number, since it uses as much as digits as its factorization.

1229209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1229209 is about 1108.6969829489. The cubic root of 1229209 is about 107.1211542920.

The spelling of 1229209 in words is "one million, two hundred twenty-nine thousand, two hundred nine".