2081851 has 2 divisors, whose sum is σ = 2081852. Its totient is φ = 2081850.

The previous prime is 2081843. The next prime is 2081861. The reversal of 2081851 is 1581802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2081851 - 2³ = 2081843 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (2081801) 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 as a sum of consecutive naturals, namely, 1040925 + 1040926.

It is an arithmetic number, because the mean of its divisors is an integer number (1040926).

2^2081851 is an apocalyptic number.

2081851 is a deficient number, since it is larger than the sum of its proper divisors (1).

2081851 is an equidigital number, since it uses as much as digits as its factorization.

2081851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 2081851 is about 1442.8620862716. The cubic root of 2081851 is about 127.6879401847.

The spelling of 2081851 in words is "two million, eighty-one thousand, eight hundred fifty-one".