11566889 has 2 divisors, whose sum is σ = 11566890. Its totient is φ = 11566888.

The previous prime is 11566873. The next prime is 11566897. The reversal of 11566889 is 98866511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11560000 + 6889 = 3400^2 + 83^2 .

It is a cyclic number.

It is not a de Polignac number, because 11566889 - 2⁴ = 11566873 is a prime.

It is a super-2 number, since 2×11566889² = 267585842276642, which contains 22 as substring.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (11566859) 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, 5783444 + 5783445.

It is an arithmetic number, because the mean of its divisors is an integer number (5783445).

Almost surely, 2^11566889 is an apocalyptic number.

It is an amenable number.

11566889 is a deficient number, since it is larger than the sum of its proper divisors (1).

11566889 is an equidigital number, since it uses as much as digits as its factorization.

11566889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 44.

The square root of 11566889 is about 3401.0129373468. The cubic root of 11566889 is about 226.1546504603.

It can be divided in two parts, 1156 and 6889, that multiplied together give a square (7963684 = 2822²).

The spelling of 11566889 in words is "eleven million, five hundred sixty-six thousand, eight hundred eighty-nine".