84755221 has 2 divisors, whose sum is σ = 84755222. Its totient is φ = 84755220.

The previous prime is 84755213. The next prime is 84755227. The reversal of 84755221 is 12255748.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81902500 + 2852721 = 9050^2 + 1689^2 .

It is a cyclic number.

It is not a de Polignac number, because 84755221 - 2³ = 84755213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84755227) 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, 42377610 + 42377611.

It is an arithmetic number, because the mean of its divisors is an integer number (42377611).

Almost surely, 2^84755221 is an apocalyptic number.

It is an amenable number.

84755221 is a deficient number, since it is larger than the sum of its proper divisors (1).

84755221 is an equidigital number, since it uses as much as digits as its factorization.

84755221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22400, while the sum is 34.

The square root of 84755221 is about 9206.2598811895. The cubic root of 84755221 is about 439.2605019848.

The spelling of 84755221 in words is "eighty-four million, seven hundred fifty-five thousand, two hundred twenty-one".