2318821 has 2 divisors, whose sum is σ = 2318822. Its totient is φ = 2318820.

The previous prime is 2318819. The next prime is 2318843. The reversal of 2318821 is 1288132.

2318821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1809025 + 509796 = 1345^2 + 714^2 .

It is a cyclic number.

It is not a de Polignac number, because 2318821 - 2¹ = 2318819 is a prime.

Together with 2318819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2318801) 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, 1159410 + 1159411.

It is an arithmetic number, because the mean of its divisors is an integer number (1159411).

2^2318821 is an apocalyptic number.

It is an amenable number.

2318821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2318821 is an equidigital number, since it uses as much as digits as its factorization.

2318821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 25.

The square root of 2318821 is about 1522.7675462788. The cubic root of 2318821 is about 132.3596900863.

The spelling of 2318821 in words is "two million, three hundred eighteen thousand, eight hundred twenty-one".