2288821 has 2 divisors, whose sum is σ = 2288822. Its totient is φ = 2288820.

The previous prime is 2288809. The next prime is 2288831. The reversal of 2288821 is 1288822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1347921 + 940900 = 1161^2 + 970^2 .

It is a cyclic number.

It is not a de Polignac number, because 2288821 - 2¹¹ = 2286773 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2288801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1144410 + 1144411.

It is an arithmetic number, because the mean of its divisors is an integer number (1144411).

2^2288821 is an apocalyptic number.

It is an amenable number.

2288821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2288821 is an equidigital number, since it uses as much as digits as its factorization.

2288821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4096, while the sum is 31.

The square root of 2288821 is about 1512.8849923243. The cubic root of 2288821 is about 131.7864046343.

Subtracting from 2288821 its reverse (1288822), we obtain a palindrome (999999).

The spelling of 2288821 in words is "two million, two hundred eighty-eight thousand, eight hundred twenty-one".