11188889 has 2 divisors, whose sum is σ = 11188890. Its totient is φ = 11188888.

The previous prime is 11188759. The next prime is 11188897. The reversal of 11188889 is 98888111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8410000 + 2778889 = 2900^2 + 1667^2 .

It is a cyclic number.

It is not a de Polignac number, because 11188889 - 2⁸ = 11188633 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (11184889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5594444 + 5594445.

It is an arithmetic number, because the mean of its divisors is an integer number (5594445).

Almost surely, 2^11188889 is an apocalyptic number.

It is an amenable number.

11188889 is a deficient number, since it is larger than the sum of its proper divisors (1).

11188889 is an equidigital number, since it uses as much as digits as its factorization.

11188889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36864, while the sum is 44.

The square root of 11188889 is about 3344.9796710892. The cubic root of 11188889 is about 223.6637773125.

The spelling of 11188889 in words is "eleven million, one hundred eighty-eight thousand, eight hundred eighty-nine".