84287321 has 2 divisors, whose sum is σ = 84287322. Its totient is φ = 84287320.

The previous prime is 84287317. The next prime is 84287323. The reversal of 84287321 is 12378248.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70744921 + 13542400 = 8411^2 + 3680^2 .

It is a cyclic number.

It is not a de Polignac number, because 84287321 - 2² = 84287317 is a prime.

Together with 84287323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84287323) by changing a digit.

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, 42143660 + 42143661.

It is an arithmetic number, because the mean of its divisors is an integer number (42143661).

Almost surely, 2^84287321 is an apocalyptic number.

It is an amenable number.

84287321 is a deficient number, since it is larger than the sum of its proper divisors (1).

84287321 is an equidigital number, since it uses as much as digits as its factorization.

84287321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21504, while the sum is 35.

The square root of 84287321 is about 9180.8126546619. The cubic root of 84287321 is about 438.4506821794.

The spelling of 84287321 in words is "eighty-four million, two hundred eighty-seven thousand, three hundred twenty-one".