84751729 has 2 divisors, whose sum is σ = 84751730. Its totient is φ = 84751728.

The previous prime is 84751721. The next prime is 84751769. The reversal of 84751729 is 92715748.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71791729 + 12960000 = 8473^2 + 3600^2 .

It is a cyclic number.

It is not a de Polignac number, because 84751729 - 2³ = 84751721 is a prime.

It is not a weakly prime, because it can be changed into another prime (84751721) 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, 42375864 + 42375865.

It is an arithmetic number, because the mean of its divisors is an integer number (42375865).

Almost surely, 2^84751729 is an apocalyptic number.

It is an amenable number.

84751729 is a deficient number, since it is larger than the sum of its proper divisors (1).

84751729 is an equidigital number, since it uses as much as digits as its factorization.

84751729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 43.

The square root of 84751729 is about 9206.0702256718. The cubic root of 84751729 is about 439.2544692443.

The spelling of 84751729 in words is "eighty-four million, seven hundred fifty-one thousand, seven hundred twenty-nine".