2804561 has 8 divisors (see below), whose sum is σ = 2934120. Its totient is φ = 2677248.

The previous prime is 2804531. The next prime is 2804567. The reversal of 2804561 is 1654082.

2804561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 844561 + 1960000 = 919^2 + 1400^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2804561 - 2⁶ = 2804497 is a prime.

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 2804561.

It is not an unprimeable number, because it can be changed into a prime (2804567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2315 + ... + 3311.

It is an arithmetic number, because the mean of its divisors is an integer number (366765).

2^2804561 is an apocalyptic number.

It is an amenable number.

2804561 is a deficient number, since it is larger than the sum of its proper divisors (129559).

2804561 is an equidigital number, since it uses as much as digits as its factorization.

2804561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 2804561 is about 1674.6823579414. The cubic root of 2804561 is about 141.0224634331.

The spelling of 2804561 in words is "two million, eight hundred four thousand, five hundred sixty-one".