2081971 has 4 divisors (see below), whose sum is σ = 2086200. Its totient is φ = 2077744.

The previous prime is 2081969. The next prime is 2082019. The reversal of 2081971 is 1791802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1791802 = 2 ⋅895901.

It is a cyclic number.

It is not a de Polignac number, because 2081971 - 2¹ = 2081969 is a prime.

It is a Duffinian number.

2081971 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2081921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1261 + ... + 2398.

It is an arithmetic number, because the mean of its divisors is an integer number (521550).

2^2081971 is an apocalyptic number.

2081971 is a deficient number, since it is larger than the sum of its proper divisors (4229).

2081971 is an equidigital number, since it uses as much as digits as its factorization.

2081971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4228.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 2081971 is about 1442.9036696883. The cubic root of 2081971 is about 127.6903934916.

The spelling of 2081971 in words is "two million, eighty-one thousand, nine hundred seventy-one".