Base | Representation |
---|---|
bin | 10011101011111… |
… | …01100001010001 |
3 | 102111202000021002 |
4 | 21311331201101 |
5 | 314233444221 |
6 | 24215311345 |
7 | 4043446235 |
oct | 1165754121 |
9 | 374660232 |
10 | 165140561 |
11 | 85243603 |
12 | 4737b555 |
13 | 282a0511 |
14 | 17d0a5c5 |
15 | e77080b |
hex | 9d7d851 |
165140561 has 2 divisors, whose sum is σ = 165140562. Its totient is φ = 165140560.
The previous prime is 165140543. The next prime is 165140581. The reversal of 165140561 is 165041561.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 164968336 + 172225 = 12844^2 + 415^2 .
It is an emirp because it is prime and its reverse (165041561) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 165140561 - 210 = 165139537 is a prime.
It is not a weakly prime, because it can be changed into another prime (165140501) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82570280 + 82570281.
It is an arithmetic number, because the mean of its divisors is an integer number (82570281).
Almost surely, 2165140561 is an apocalyptic number.
It is an amenable number.
165140561 is a deficient number, since it is larger than the sum of its proper divisors (1).
165140561 is an equidigital number, since it uses as much as digits as its factorization.
165140561 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 3600, while the sum is 29.
The square root of 165140561 is about 12850.7027434300. The cubic root of 165140561 is about 548.6363584912.
The spelling of 165140561 in words is "one hundred sixty-five million, one hundred forty thousand, five hundred sixty-one".
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