99729989 has 2 divisors, whose sum is σ = 99729990. Its totient is φ = 99729988.

The previous prime is 99729983. The next prime is 99730009. The reversal of 99729989 is 98992799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91833889 + 7896100 = 9583^2 + 2810^2 .

It is an emirp because it is prime and its reverse (98992799) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99729989 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99729983) 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, 49864994 + 49864995.

It is an arithmetic number, because the mean of its divisors is an integer number (49864995).

Almost surely, 2^99729989 is an apocalyptic number.

It is an amenable number.

99729989 is a deficient number, since it is larger than the sum of its proper divisors (1).

99729989 is an equidigital number, since it uses as much as digits as its factorization.

99729989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6613488, while the sum is 62.

The square root of 99729989 is about 9986.4903244333. The cubic root of 99729989 is about 463.7407467827.

The spelling of 99729989 in words is "ninety-nine million, seven hundred twenty-nine thousand, nine hundred eighty-nine".