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989999909 is a prime number
BaseRepresentation
bin111011000000100…
…011001100100101
32112222212012120022
4323000203030211
54011414444114
6242123044525
733350601053
oct7300431445
92488765508
10989999909
11468913648
12237670745
1312a148582
14956a71d3
155bda848e
hex3b023325

989999909 has 2 divisors, whose sum is σ = 989999910. Its totient is φ = 989999908.

The previous prime is 989999887. The next prime is 989999917. The reversal of 989999909 is 909999989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 527620900 + 462379009 = 22970^2 + 21503^2 .

It is an emirp because it is prime and its reverse (909999989) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-989999909 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 (989929909) 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, 494999954 + 494999955.

It is an arithmetic number, because the mean of its divisors is an integer number (494999955).

Almost surely, 2989999909 is an apocalyptic number.

It is an amenable number.

989999909 is a deficient number, since it is larger than the sum of its proper divisors (1).

989999909 is an equidigital number, since it uses as much as digits as its factorization.

989999909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38263752, while the sum is 71.

The square root of 989999909 is about 31464.2639990196. The cubic root of 989999909 is about 996.6554628753.

The spelling of 989999909 in words is "nine hundred eighty-nine million, nine hundred ninety-nine thousand, nine hundred nine".