2806121 has 2 divisors, whose sum is σ = 2806122. Its totient is φ = 2806120.

The previous prime is 2806109. The next prime is 2806123. The reversal of 2806121 is 1216082.

2806121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1413721 + 1392400 = 1189^2 + 1180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2806121 is a prime.

Together with 2806123, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2806093 and 2806102.

It is not a weakly prime, because it can be changed into another prime (2806123) by changing a digit.

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 as a sum of consecutive naturals, namely, 1403060 + 1403061.

It is an arithmetic number, because the mean of its divisors is an integer number (1403061).

2^2806121 is an apocalyptic number.

It is an amenable number.

2806121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2806121 is an equidigital number, since it uses as much as digits as its factorization.

2806121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 2806121 is about 1675.1480531583. The cubic root of 2806121 is about 141.0486058806.

It can be divided in two parts, 28061 and 21, that added together give a palindrome (28082).

The spelling of 2806121 in words is "two million, eight hundred six thousand, one hundred twenty-one".