11205009 has 6 divisors (see below), whose sum is σ = 16185026. Its totient is φ = 7470000.

The previous prime is 11204993. The next prime is 11205017. The reversal of 11205009 is 90050211.

It can be written as a sum of positive squares in only one way, i.e., 7700625 + 3504384 = 2775^2 + 1872^2 .

It is not a de Polignac number, because 11205009 - 2⁴ = 11204993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11204982 and 11205000.

It is not an unprimeable number, because it can be changed into a prime (11205059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 622492 + ... + 622509.

Almost surely, 2^11205009 is an apocalyptic number.

It is an amenable number.

11205009 is a deficient number, since it is larger than the sum of its proper divisors (4980017).

11205009 is a wasteful number, since it uses less digits than its factorization.

11205009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245007 (or 1245004 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 11205009 is about 3347.3883849951. The cubic root of 11205009 is about 223.7711376887.

The spelling of 11205009 in words is "eleven million, two hundred five thousand, nine".