Base | Representation |
---|---|
bin | 1000001000000… |
… | …00100101000101 |
3 | 11202020212200112 |
4 | 10010000211011 |
5 | 114422103223 |
6 | 10432522405 |
7 | 1455230441 |
oct | 404004505 |
9 | 152225615 |
10 | 68159813 |
11 | 35524527 |
12 | 1a9b0405 |
13 | 11176067 |
14 | 90a3821 |
15 | 5eb5778 |
hex | 4100945 |
68159813 has 2 divisors, whose sum is σ = 68159814. Its totient is φ = 68159812.
The previous prime is 68159807. The next prime is 68159827. The reversal of 68159813 is 31895186.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 57183844 + 10975969 = 7562^2 + 3313^2 .
It is a cyclic number.
It is not a de Polignac number, because 68159813 - 216 = 68094277 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 (68159843) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34079906 + 34079907.
It is an arithmetic number, because the mean of its divisors is an integer number (34079907).
Almost surely, 268159813 is an apocalyptic number.
It is an amenable number.
68159813 is a deficient number, since it is larger than the sum of its proper divisors (1).
68159813 is an equidigital number, since it uses as much as digits as its factorization.
68159813 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 51840, while the sum is 41.
The square root of 68159813 is about 8255.8956509878. The cubic root of 68159813 is about 408.4850156828.
The spelling of 68159813 in words is "sixty-eight million, one hundred fifty-nine thousand, eight hundred thirteen".
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