11220989 has 4 divisors (see below), whose sum is σ = 12084156. Its totient is φ = 10357824.

The previous prime is 11220931. The next prime is 11220991. The reversal of 11220989 is 98902211.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98902211 = 2389 ⋅41399.

It can be written as a sum of positive squares in 2 ways, for example, as 5736025 + 5484964 = 2395^2 + 2342^2 .

It is a cyclic number.

It is not a de Polignac number, because 11220989 - 2¹⁶ = 11155453 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 (11220689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431564 + ... + 431589.

It is an arithmetic number, because the mean of its divisors is an integer number (3021039).

Almost surely, 2^11220989 is an apocalyptic number.

It is an amenable number.

11220989 is a deficient number, since it is larger than the sum of its proper divisors (863167).

11220989 is an equidigital number, since it uses as much as digits as its factorization.

11220989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863166.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 11220989 is about 3349.7744700203. The cubic root of 11220989 is about 223.8774640713.

The spelling of 11220989 in words is "eleven million, two hundred twenty thousand, nine hundred eighty-nine".