1115221 has 4 divisors (see below), whose sum is σ = 1130572. Its totient is φ = 1099872.

The previous prime is 1115207. The next prime is 1115227. The reversal of 1115221 is 1225111.

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 324900 + 790321 = 570^2 + 889^2 .

It is a cyclic number.

It is not a de Polignac number, because 1115221 - 2⁵ = 1115189 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 (1115227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7566 + ... + 7711.

It is an arithmetic number, because the mean of its divisors is an integer number (282643).

2^1115221 is an apocalyptic number.

It is an amenable number.

1115221 is a deficient number, since it is larger than the sum of its proper divisors (15351).

1115221 is an equidigital number, since it uses as much as digits as its factorization.

1115221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15350.

The product of its digits is 20, while the sum is 13.

The square root of 1115221 is about 1056.0402454452. The cubic root of 1115221 is about 103.7019635369.

The spelling of 1115221 in words is "one million, one hundred fifteen thousand, two hundred twenty-one".