2865121 has 16 divisors (see below), whose sum is σ = 3427200. Its totient is φ = 2344320.

The previous prime is 2865097. The next prime is 2865131. The reversal of 2865121 is 1215682.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2865121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2865131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19155 + ... + 19303.

It is an arithmetic number, because the mean of its divisors is an integer number (214200).

2^2865121 is an apocalyptic number.

It is an amenable number.

2865121 is a deficient number, since it is larger than the sum of its proper divisors (562079).

2865121 is a wasteful number, since it uses less digits than its factorization.

2865121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264.

The product of its digits is 960, while the sum is 25.

The square root of 2865121 is about 1692.6668307733. Note that the first 3 decimals coincide. The cubic root of 2865121 is about 142.0302950637.

The spelling of 2865121 in words is "two million, eight hundred sixty-five thousand, one hundred twenty-one".