2809081 has 4 divisors (see below), whose sum is σ = 3064464. Its totient is φ = 2553700.

The previous prime is 2809073. The next prime is 2809087. The reversal of 2809081 is 1809082.

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 2809081 - 2³ = 2809073 is a prime.

It is a super-2 number, since 2×2809081² = 15781872129122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2809087) 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, 127675 + ... + 127696.

It is an arithmetic number, because the mean of its divisors is an integer number (766116).

2^2809081 is an apocalyptic number.

It is an amenable number.

2809081 is a deficient number, since it is larger than the sum of its proper divisors (255383).

2809081 is a wasteful number, since it uses less digits than its factorization.

2809081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255382.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 2809081 is about 1676.0313242896. The cubic root of 2809081 is about 141.0981828779.

Subtracting from 2809081 its reverse (1809082), we obtain a palindrome (999999).

The spelling of 2809081 in words is "two million, eight hundred nine thousand, eighty-one".