1151209 has 2 divisors, whose sum is σ = 1151210. Its totient is φ = 1151208.

The previous prime is 1151203. The next prime is 1151221. The reversal of 1151209 is 9021511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1149184 + 2025 = 1072^2 + 45^2 .

It is an emirp because it is prime and its reverse (9021511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1151209 - 2⁵ = 1151177 is a prime.

1151209 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1151203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 575604 + 575605.

It is an arithmetic number, because the mean of its divisors is an integer number (575605).

2^1151209 is an apocalyptic number.

It is an amenable number.

1151209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1151209 is an equidigital number, since it uses as much as digits as its factorization.

1151209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90, while the sum is 19.

The square root of 1151209 is about 1072.9440805559. The cubic root of 1151209 is about 104.8056571447.

It can be divided in two parts, 115120 and 9, that multiplied together give a triangular number (1036080 = T₁₄₃₉).

The spelling of 1151209 in words is "one million, one hundred fifty-one thousand, two hundred nine".