11512009 has 4 divisors (see below), whose sum is σ = 12189204. Its totient is φ = 10834816.

The previous prime is 11511989. The next prime is 11512013. The reversal of 11512009 is 90021511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90021511 = 17 ⋅5295383.

It can be written as a sum of positive squares in 2 ways, for example, as 10419984 + 1092025 = 3228^2 + 1045^2 .

It is a cyclic number.

It is not a de Polignac number, because 11512009 - 2⁵ = 11511977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11512609) 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 3 ways as a sum of consecutive naturals, for example, 338572 + ... + 338605.

It is an arithmetic number, because the mean of its divisors is an integer number (3047301).

Almost surely, 2^11512009 is an apocalyptic number.

It is an amenable number.

11512009 is a deficient number, since it is larger than the sum of its proper divisors (677195).

11512009 is an equidigital number, since it uses as much as digits as its factorization.

11512009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677194.

The product of its (nonzero) digits is 90, while the sum is 19.

The square root of 11512009 is about 3392.9351600053. The cubic root of 11512009 is about 225.7964138876.

It can be divided in two parts, 1151 and 2009, that added together give a triangular number (3160 = T₇₉).

The spelling of 11512009 in words is "eleven million, five hundred twelve thousand, nine".