99128929 has 2 divisors, whose sum is σ = 99128930. Its totient is φ = 99128928.

The previous prime is 99128927. The next prime is 99128941. The reversal of 99128929 is 92982199.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64883025 + 34245904 = 8055^2 + 5852^2 .

It is an emirp because it is prime and its reverse (92982199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99128929 - 2¹ = 99128927 is a prime.

Together with 99128927, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (99128923) 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, 49564464 + 49564465.

It is an arithmetic number, because the mean of its divisors is an integer number (49564465).

Almost surely, 2^99128929 is an apocalyptic number.

It is an amenable number.

99128929 is a deficient number, since it is larger than the sum of its proper divisors (1).

99128929 is an equidigital number, since it uses as much as digits as its factorization.

99128929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 49.

The square root of 99128929 is about 9956.3511890652. The cubic root of 99128929 is about 462.8072333116.

The spelling of 99128929 in words is "ninety-nine million, one hundred twenty-eight thousand, nine hundred twenty-nine".