2801565 has 24 divisors (see below), whose sum is σ = 5230680. Its totient is φ = 1378944.

The previous prime is 2801543. The next prime is 2801573. The reversal of 2801565 is 5651082.

It can be written as a sum of positive squares in 4 ways, for example, as 49284 + 2752281 = 222^2 + 1659^2 .

It is not a de Polignac number, because 2801565 - 2¹⁰ = 2800541 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1810 + ... + 2979.

It is an arithmetic number, because the mean of its divisors is an integer number (217945).

2^2801565 is an apocalyptic number.

It is an amenable number.

2801565 is a deficient number, since it is larger than the sum of its proper divisors (2429115).

2801565 is a wasteful number, since it uses less digits than its factorization.

2801565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4813 (or 4810 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 2801565 is about 1673.7876209364. The cubic root of 2801565 is about 140.9722293278.

The spelling of 2801565 in words is "two million, eight hundred one thousand, five hundred sixty-five".