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1288109 is a prime number
BaseRepresentation
bin100111010011110101101
32102102221202
410322132231
5312204414
643335245
713643264
oct4723655
92372852
101288109
117aa859
12521525
133613c4
142575db
151a69de
hex13a7ad

1288109 has 2 divisors, whose sum is σ = 1288110. Its totient is φ = 1288108.

The previous prime is 1288103. The next prime is 1288117. The reversal of 1288109 is 9018821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1162084 + 126025 = 1078^2 + 355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-1288109 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1288103) 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, 644054 + 644055.

It is an arithmetic number, because the mean of its divisors is an integer number (644055).

21288109 is an apocalyptic number.

It is an amenable number.

1288109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1288109 is an equidigital number, since it uses as much as digits as its factorization.

1288109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 1288109 is about 1134.9488975280. The cubic root of 1288109 is about 108.8055056416.

The spelling of 1288109 in words is "one million, two hundred eighty-eight thousand, one hundred nine".