2285821 has 2 divisors, whose sum is σ = 2285822. Its totient is φ = 2285820.

The previous prime is 2285813. The next prime is 2285861. The reversal of 2285821 is 1285822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1653796 + 632025 = 1286^2 + 795^2 .

It is a cyclic number.

It is not a de Polignac number, because 2285821 - 2³ = 2285813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2285821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2285861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1142910 + 1142911.

It is an arithmetic number, because the mean of its divisors is an integer number (1142911).

2^2285821 is an apocalyptic number.

It is an amenable number.

2285821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2285821 is an equidigital number, since it uses as much as digits as its factorization.

2285821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2560, while the sum is 28.

The square root of 2285821 is about 1511.8931840577. The cubic root of 2285821 is about 131.7288011673.

Subtracting from 2285821 its reverse (1285822), we obtain a palindrome (999999).

The spelling of 2285821 in words is "two million, two hundred eighty-five thousand, eight hundred twenty-one".