2891065 has 4 divisors (see below), whose sum is σ = 3469284. Its totient is φ = 2312848.

The previous prime is 2891051. The next prime is 2891081. The reversal of 2891065 is 5601982.

2891065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5601982 = 2 ⋅2800991.

It can be written as a sum of positive squares in 2 ways, for example, as 571536 + 2319529 = 756^2 + 1523^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2891065 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 289102 + ... + 289111.

It is an arithmetic number, because the mean of its divisors is an integer number (867321).

2^2891065 is an apocalyptic number.

It is an amenable number.

2891065 is a deficient number, since it is larger than the sum of its proper divisors (578219).

2891065 is an equidigital number, since it uses as much as digits as its factorization.

2891065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578218.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 2891065 is about 1700.3132064417. The cubic root of 2891065 is about 142.4577077736.

The spelling of 2891065 in words is "two million, eight hundred ninety-one thousand, sixty-five".