820411 has 2 divisors, whose sum is σ = 820412. Its totient is φ = 820410.

The previous prime is 820409. The next prime is 820427. The reversal of 820411 is 114028.

It is a happy number.

820411 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (820427) can be obtained adding 820411 to its sum of digits (16).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 820411 - 2¹ = 820409 is a prime.

Together with 820409, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (820441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410205 + 410206.

It is an arithmetic number, because the mean of its divisors is an integer number (410206).

2⁸²⁰⁴¹¹ is an apocalyptic number.

820411 is a deficient number, since it is larger than the sum of its proper divisors (1).

820411 is an equidigital number, since it uses as much as digits as its factorization.

820411 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 820411 is about 905.7654221707. The cubic root of 820411 is about 93.6146515039.

Adding to 820411 its reverse (114028), we get a palindrome (934439).

The spelling of 820411 in words is "eight hundred twenty thousand, four hundred eleven".