847321 has 2 divisors, whose sum is σ = 847322. Its totient is φ = 847320.

The previous prime is 847309. The next prime is 847339. The reversal of 847321 is 123748.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 632025 + 215296 = 795^2 + 464^2 .

It is a cyclic number.

It is not a de Polignac number, because 847321 - 2⁷ = 847193 is a prime.

It is the 921-st Hogben number.

It is equal to p₆₇₄₂₆ and since 847321 and 67426 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 (847361) by changing a digit.

It is a nontrivial repunit in base 920.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 423660 + 423661.

It is an arithmetic number, because the mean of its divisors is an integer number (423661).

2⁸⁴⁷³²¹ is an apocalyptic number.

It is an amenable number.

847321 is a deficient number, since it is larger than the sum of its proper divisors (1).

847321 is an equidigital number, since it uses as much as digits as its factorization.

847321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 25.

The square root of 847321 is about 920.5004073872. The cubic root of 847321 is about 94.6272000952.

The spelling of 847321 in words is "eight hundred forty-seven thousand, three hundred twenty-one".