84381229 has 2 divisors, whose sum is σ = 84381230. Its totient is φ = 84381228.

The previous prime is 84381139. The next prime is 84381257. The reversal of 84381229 is 92218348.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47293129 + 37088100 = 6877^2 + 6090^2 .

It is a cyclic number.

It is not a de Polignac number, because 84381229 - 2¹⁵ = 84348461 is a prime.

It is equal to p_4909906 and since 84381229 and 4909906 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84381529) 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, 42190614 + 42190615.

It is an arithmetic number, because the mean of its divisors is an integer number (42190615).

Almost surely, 2^84381229 is an apocalyptic number.

It is an amenable number.

84381229 is a deficient number, since it is larger than the sum of its proper divisors (1).

84381229 is an equidigital number, since it uses as much as digits as its factorization.

84381229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 37.

The square root of 84381229 is about 9185.9255929928. The cubic root of 84381229 is about 438.6134537739.

The spelling of 84381229 in words is "eighty-four million, three hundred eighty-one thousand, two hundred twenty-nine".