2805281 has 4 divisors (see below), whose sum is σ = 2844864. Its totient is φ = 2765700.

The previous prime is 2805263. The next prime is 2805311. The reversal of 2805281 is 1825082.

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 2805281 - 2¹⁰ = 2804257 is a prime.

It is a super-2 number, since 2×2805281² = 15739202977922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2805281.

It is not an unprimeable number, because it can be changed into a prime (2805251) 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, 19685 + ... + 19826.

It is an arithmetic number, because the mean of its divisors is an integer number (711216).

2^2805281 is an apocalyptic number.

It is an amenable number.

2805281 is a deficient number, since it is larger than the sum of its proper divisors (39583).

2805281 is an equidigital number, since it uses as much as digits as its factorization.

2805281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39582.

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 2805281 is about 1674.8973102850. The cubic root of 2805281 is about 141.0345303824.

The spelling of 2805281 in words is "two million, eight hundred five thousand, two hundred eighty-one".