2113809 has 4 divisors (see below), whose sum is σ = 2818416. Its totient is φ = 1409204.

The previous prime is 2113801. The next prime is 2113819. The reversal of 2113809 is 9083112.

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 2113809 - 2³ = 2113801 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (2113801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352299 + ... + 352304.

It is an arithmetic number, because the mean of its divisors is an integer number (704604).

2^2113809 is an apocalyptic number.

It is an amenable number.

2113809 is a deficient number, since it is larger than the sum of its proper divisors (704607).

2113809 is an equidigital number, since it uses as much as digits as its factorization.

2113809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704606.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 2113809 is about 1453.8944253281. The cubic root of 2113809 is about 128.3379942461.

The spelling of 2113809 in words is "two million, one hundred thirteen thousand, eight hundred nine".