84881729 has 2 divisors, whose sum is σ = 84881730. Its totient is φ = 84881728.

The previous prime is 84881717. The next prime is 84881747. The reversal of 84881729 is 92718848.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60031504 + 24850225 = 7748^2 + 4985^2 .

It is a cyclic number.

It is not a de Polignac number, because 84881729 - 2⁸ = 84881473 is a prime.

It is not a weakly prime, because it can be changed into another prime (84881789) 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, 42440864 + 42440865.

It is an arithmetic number, because the mean of its divisors is an integer number (42440865).

Almost surely, 2^84881729 is an apocalyptic number.

It is an amenable number.

84881729 is a deficient number, since it is larger than the sum of its proper divisors (1).

84881729 is an equidigital number, since it uses as much as digits as its factorization.

84881729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 258048, while the sum is 47.

The square root of 84881729 is about 9213.1280789968. The cubic root of 84881729 is about 439.4789441504.

The spelling of 84881729 in words is "eighty-four million, eight hundred eighty-one thousand, seven hundred twenty-nine".