1118221 has 4 divisors (see below), whose sum is σ = 1204252. Its totient is φ = 1032192.

The previous prime is 1118219. The next prime is 1118261. The reversal of 1118221 is 1228111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1228111 = 89 ⋅13799.

It can be written as a sum of positive squares in 2 ways, for example, as 455625 + 662596 = 675^2 + 814^2 .

It is a cyclic number.

It is not a de Polignac number, because 1118221 - 2¹ = 1118219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1118195 and 1118204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1118261) 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, 42996 + ... + 43021.

It is an arithmetic number, because the mean of its divisors is an integer number (301063).

2^1118221 is an apocalyptic number.

It is an amenable number.

1118221 is a deficient number, since it is larger than the sum of its proper divisors (86031).

1118221 is an equidigital number, since it uses as much as digits as its factorization.

1118221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86030.

The product of its digits is 32, while the sum is 16.

The square root of 1118221 is about 1057.4596919032. The cubic root of 1118221 is about 103.7948680952.

The spelling of 1118221 in words is "one million, one hundred eighteen thousand, two hundred twenty-one".