1166221 has 4 divisors (see below), whose sum is σ = 1332832. Its totient is φ = 999612.

The previous prime is 1166219. The next prime is 1166227. The reversal of 1166221 is 1226611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1166221 - 2¹ = 1166219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166227) 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 3 ways as a sum of consecutive naturals, for example, 83295 + ... + 83308.

It is an arithmetic number, because the mean of its divisors is an integer number (333208).

2^1166221 is an apocalyptic number.

It is an amenable number.

1166221 is a deficient number, since it is larger than the sum of its proper divisors (166611).

1166221 is an equidigital number, since it uses as much as digits as its factorization.

1166221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166610.

The product of its digits is 144, while the sum is 19.

The square root of 1166221 is about 1079.9171264500. The cubic root of 1166221 is about 105.2592535350.

The spelling of 1166221 in words is "one million, one hundred sixty-six thousand, two hundred twenty-one".