820241 has 2 divisors, whose sum is σ = 820242. Its totient is φ = 820240.

The previous prime is 820231. The next prime is 820243. The reversal of 820241 is 142028.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 817216 + 3025 = 904^2 + 55^2 .

It is a cyclic number.

It is not a de Polignac number, because 820241 - 2⁶ = 820177 is a prime.

Together with 820243, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410120 + 410121.

It is an arithmetic number, because the mean of its divisors is an integer number (410121).

2⁸²⁰²⁴¹ is an apocalyptic number.

It is an amenable number.

820241 is a deficient number, since it is larger than the sum of its proper divisors (1).

820241 is an equidigital number, since it uses as much as digits as its factorization.

820241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 820241 is about 905.6715740267. The cubic root of 820241 is about 93.6081849929.

Adding to 820241 its reverse (142028), we get a palindrome (962269).

The spelling of 820241 in words is "eight hundred twenty thousand, two hundred forty-one".