1221173 has 4 divisors (see below), whose sum is σ = 1244268. Its totient is φ = 1198080.

The previous prime is 1221167. The next prime is 1221193. The reversal of 1221173 is 3711221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 552049 + 669124 = 743^2 + 818^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221173 - 2⁸ = 1220917 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 (1221113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11468 + ... + 11573.

It is an arithmetic number, because the mean of its divisors is an integer number (311067).

2^1221173 is an apocalyptic number.

It is an amenable number.

1221173 is a deficient number, since it is larger than the sum of its proper divisors (23095).

1221173 is an equidigital number, since it uses as much as digits as its factorization.

1221173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23094.

The product of its digits is 84, while the sum is 17.

The square root of 1221173 is about 1105.0669662966. The cubic root of 1221173 is about 106.8872075474.

Adding to 1221173 its reverse (3711221), we get a palindrome (4932394).

The spelling of 1221173 in words is "one million, two hundred twenty-one thousand, one hundred seventy-three".