11481809 has 4 divisors (see below), whose sum is σ = 11519040. Its totient is φ = 11444580.

The previous prime is 11481797. The next prime is 11481829. The reversal of 11481809 is 90818411.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11481809 - 2⁸ = 11481553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11481829) 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, 18149 + ... + 18770.

It is an arithmetic number, because the mean of its divisors is an integer number (2879760).

Almost surely, 2^11481809 is an apocalyptic number.

It is an amenable number.

11481809 is a deficient number, since it is larger than the sum of its proper divisors (37231).

11481809 is an equidigital number, since it uses as much as digits as its factorization.

11481809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37230.

The product of its (nonzero) digits is 2304, while the sum is 32.

The square root of 11481809 is about 3388.4818134380. The cubic root of 11481809 is about 225.5987934919.

The spelling of 11481809 in words is "eleven million, four hundred eighty-one thousand, eight hundred nine".