11821289 has 2 divisors, whose sum is σ = 11821290. Its totient is φ = 11821288.

The previous prime is 11821283. The next prime is 11821301. The reversal of 11821289 is 98212811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8508889 + 3312400 = 2917^2 + 1820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11821289 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (11821283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5910644 + 5910645.

It is an arithmetic number, because the mean of its divisors is an integer number (5910645).

Almost surely, 2^11821289 is an apocalyptic number.

It is an amenable number.

11821289 is a deficient number, since it is larger than the sum of its proper divisors (1).

11821289 is an equidigital number, since it uses as much as digits as its factorization.

11821289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 32.

The square root of 11821289 is about 3438.2101448283. The cubic root of 11821289 is about 227.8006426559.

The spelling of 11821289 in words is "eleven million, eight hundred twenty-one thousand, two hundred eighty-nine".