99128923 has 2 divisors, whose sum is σ = 99128924. Its totient is φ = 99128922.

The previous prime is 99128899. The next prime is 99128927. The reversal of 99128923 is 32982199.

It is a strong prime.

It is an emirp because it is prime and its reverse (32982199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99128923 - 2⁵ = 99128891 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99128923.

It is not a weakly prime, because it can be changed into another prime (99128927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49564461 + 49564462.

It is an arithmetic number, because the mean of its divisors is an integer number (49564462).

Almost surely, 2^99128923 is an apocalyptic number.

99128923 is a deficient number, since it is larger than the sum of its proper divisors (1).

99128923 is an equidigital number, since it uses as much as digits as its factorization.

99128923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 43.

The square root of 99128923 is about 9956.3508877500. The cubic root of 99128923 is about 462.8072239741.

The spelling of 99128923 in words is "ninety-nine million, one hundred twenty-eight thousand, nine hundred twenty-three".