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99128911 = 7211317903
BaseRepresentation
bin1011110100010…
…01011001001111
320220112021022011
411322021121033
5200334111121
613500402051
72312403400
oct572113117
9226467264
1099128911
1150a57022
1229246327
13176ca17b
14d2459a7
158a817e1
hex5e8964f

99128911 has 12 divisors (see below), whose sum is σ = 116340192. Its totient is φ = 84211008.

The previous prime is 99128899. The next prime is 99128923. The reversal of 99128911 is 11982199.

It is an interprime number because it is at equal distance from previous prime (99128899) and next prime (99128923).

It is not a de Polignac number, because 99128911 - 29 = 99128399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99128941) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3415 + ... + 14488.

It is an arithmetic number, because the mean of its divisors is an integer number (9695016).

Almost surely, 299128911 is an apocalyptic number.

99128911 is a deficient number, since it is larger than the sum of its proper divisors (17211281).

99128911 is a wasteful number, since it uses less digits than its factorization.

99128911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18030 (or 18023 counting only the distinct ones).

The product of its digits is 11664, while the sum is 40.

The square root of 99128911 is about 9956.3502851195. The cubic root of 99128911 is about 462.8072052991.

The spelling of 99128911 in words is "ninety-nine million, one hundred twenty-eight thousand, nine hundred eleven".

Divisors: 1 7 49 113 791 5537 17903 125321 877247 2023039 14161273 99128911