11023209 has 14 divisors (see below), whose sum is σ = 16528346. Its totient is φ = 7348320.

The previous prime is 11023193. The next prime is 11023223. The reversal of 11023209 is 90232011.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 8037225 + 2985984 = 2835^2 + 1728^2 .

It is not a de Polignac number, because 11023209 - 2⁴ = 11023193 is a prime.

It is a super-2 number, since 2×11023209² = 243022273315362, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11023191 and 11023200.

It is not an unprimeable number, because it can be changed into a prime (11023289) 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 13 ways as a sum of consecutive naturals, for example, 6832 + ... + 8289.

Almost surely, 2^11023209 is an apocalyptic number.

It is an amenable number.

11023209 is a deficient number, since it is larger than the sum of its proper divisors (5505137).

11023209 is an frugal number, since it uses more digits than its factorization.

11023209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15139 (or 15124 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 11023209 is about 3320.1218351139. The cubic root of 11023209 is about 222.5543123735.

The spelling of 11023209 in words is "eleven million, twenty-three thousand, two hundred nine".