1166565 has 16 divisors (see below), whose sum is σ = 1891008. Its totient is φ = 614016.

The previous prime is 1166563. The next prime is 1166567. The reversal of 1166565 is 5656611.

It is an interprime number because it is at equal distance from previous prime (1166563) and next prime (1166567).

It is not a de Polignac number, because 1166565 - 2¹ = 1166563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166563) 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 in 15 ways as a sum of consecutive naturals, for example, 777 + ... + 1713.

It is an arithmetic number, because the mean of its divisors is an integer number (118188).

2^1166565 is an apocalyptic number.

1166565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1166565 is a deficient number, since it is larger than the sum of its proper divisors (724443).

1166565 is an equidigital number, since it uses as much as digits as its factorization.

1166565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028.

The product of its digits is 5400, while the sum is 30.

The square root of 1166565 is about 1080.0763861876. The cubic root of 1166565 is about 105.2696019520.

The spelling of 1166565 in words is "one million, one hundred sixty-six thousand, five hundred sixty-five".