2641809 has 4 divisors (see below), whose sum is σ = 3522416. Its totient is φ = 1761204.

The previous prime is 2641801. The next prime is 2641811. The reversal of 2641809 is 9081462.

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 2641809 - 2³ = 2641801 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 (2641801) 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, 440299 + ... + 440304.

It is an arithmetic number, because the mean of its divisors is an integer number (880604).

2^2641809 is an apocalyptic number.

It is an amenable number.

2641809 is a deficient number, since it is larger than the sum of its proper divisors (880607).

2641809 is an equidigital number, since it uses as much as digits as its factorization.

2641809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880606.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 2641809 is about 1625.3642668645. The cubic root of 2641809 is about 138.2400254623.

The spelling of 2641809 in words is "two million, six hundred forty-one thousand, eight hundred nine".