2118009 has 4 divisors (see below), whose sum is σ = 2824016. Its totient is φ = 1412004.

The previous prime is 2118007. The next prime is 2118023. The reversal of 2118009 is 9008112.

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 not a de Polignac number, because 2118009 - 2¹ = 2118007 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2118007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352999 + ... + 353004.

It is an arithmetic number, because the mean of its divisors is an integer number (706004).

2^2118009 is an apocalyptic number.

It is an amenable number.

2118009 is a deficient number, since it is larger than the sum of its proper divisors (706007).

2118009 is an equidigital number, since it uses as much as digits as its factorization.

2118009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706006.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 2118009 is about 1455.3381050464. The cubic root of 2118009 is about 128.4229377408.

The spelling of 2118009 in words is "two million, one hundred eighteen thousand, nine".