2091071 has 4 divisors (see below), whose sum is σ = 2100672. Its totient is φ = 2081472.

The previous prime is 2091053. The next prime is 2091097. The reversal of 2091071 is 1701902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1701902 = 2 ⋅850951.

It is a cyclic number.

It is not a de Polignac number, because 2091071 - 2¹⁰ = 2090047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2091671) 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, 4466 + ... + 4911.

It is an arithmetic number, because the mean of its divisors is an integer number (525168).

2^2091071 is an apocalyptic number.

2091071 is a deficient number, since it is larger than the sum of its proper divisors (9601).

2091071 is an equidigital number, since it uses as much as digits as its factorization.

2091071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9600.

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 2091071 is about 1446.0535951340. The cubic root of 2091071 is about 127.8761619655.

Adding to 2091071 its reverse (1701902), we get a palindrome (3792973).

The spelling of 2091071 in words is "two million, ninety-one thousand, seventy-one".