2112865 has 4 divisors (see below), whose sum is σ = 2535444. Its totient is φ = 1690288.

The previous prime is 2112863. The next prime is 2112871. The reversal of 2112865 is 5682112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 349281 + 1763584 = 591^2 + 1328^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112865 - 2¹ = 2112863 is a prime.

It is a d-powerful number, because it can be written as 2⁴ + 1 + 1 + 2²¹ + 8² + 6 + 5⁶ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2112863) 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, 211282 + ... + 211291.

It is an arithmetic number, because the mean of its divisors is an integer number (633861).

2^2112865 is an apocalyptic number.

It is an amenable number.

2112865 is a deficient number, since it is larger than the sum of its proper divisors (422579).

2112865 is an equidigital number, since it uses as much as digits as its factorization.

2112865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422578.

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

The square root of 2112865 is about 1453.5697437688. The cubic root of 2112865 is about 128.3188867005.

Adding to 2112865 its reverse (5682112), we get a palindrome (7794977).

The spelling of 2112865 in words is "two million, one hundred twelve thousand, eight hundred sixty-five".