842161 has 2 divisors, whose sum is σ = 842162. Its totient is φ = 842160.

The previous prime is 842159. The next prime is 842167. The reversal of 842161 is 161248.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 518400 + 323761 = 720^2 + 569^2 .

It is a cyclic number.

It is not a de Polignac number, because 842161 - 2¹ = 842159 is a prime.

Together with 842159, it forms a pair of twin primes.

It is equal to p₆₇₀₄₅ and since 842161 and 67045 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (842167) 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, 421080 + 421081.

It is an arithmetic number, because the mean of its divisors is an integer number (421081).

2⁸⁴²¹⁶¹ is an apocalyptic number.

It is an amenable number.

842161 is a deficient number, since it is larger than the sum of its proper divisors (1).

842161 is an equidigital number, since it uses as much as digits as its factorization.

842161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 22.

The square root of 842161 is about 917.6933038875. The cubic root of 842161 is about 94.4347225159.

The spelling of 842161 in words is "eight hundred forty-two thousand, one hundred sixty-one".