11671209 has 20 divisors (see below), whose sum is σ = 19021200. Its totient is φ = 7072920.

The previous prime is 11671207. The next prime is 11671217. The reversal of 11671209 is 90217611.

It is not a de Polignac number, because 11671209 - 2¹ = 11671207 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (11671201) 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 19 ways as a sum of consecutive naturals, for example, 5659 + ... + 7440.

It is an arithmetic number, because the mean of its divisors is an integer number (951060).

Almost surely, 2^11671209 is an apocalyptic number.

It is an amenable number.

11671209 is a deficient number, since it is larger than the sum of its proper divisors (7349991).

11671209 is a wasteful number, since it uses less digits than its factorization.

11671209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13122 (or 13113 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The square root of 11671209 is about 3416.3151201258. The cubic root of 11671209 is about 226.8325014310.

The spelling of 11671209 in words is "eleven million, six hundred seventy-one thousand, two hundred nine".