99881729 has 2 divisors, whose sum is σ = 99881730. Its totient is φ = 99881728.

The previous prime is 99881711. The next prime is 99881767. The reversal of 99881729 is 92718899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71791729 + 28090000 = 8473^2 + 5300^2 .

It is a cyclic number.

It is not a de Polignac number, because 99881729 - 2¹² = 99877633 is a prime.

It is not a weakly prime, because it can be changed into another prime (99881779) 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, 49940864 + 49940865.

It is an arithmetic number, because the mean of its divisors is an integer number (49940865).

Almost surely, 2^99881729 is an apocalyptic number.

It is an amenable number.

99881729 is a deficient number, since it is larger than the sum of its proper divisors (1).

99881729 is an equidigital number, since it uses as much as digits as its factorization.

99881729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 53.

The square root of 99881729 is about 9994.0847004616. The cubic root of 99881729 is about 463.9758227221.

The spelling of 99881729 in words is "ninety-nine million, eight hundred eighty-one thousand, seven hundred twenty-nine".