Base | Representation |
---|---|
bin | 11000100111100… |
… | …00101010111001 |
3 | 112101120121220121 |
4 | 30103300222321 |
5 | 410331203211 |
6 | 32254053241 |
7 | 5055164203 |
oct | 1423605271 |
9 | 471517817 |
10 | 206506681 |
11 | a6627587 |
12 | 591aa221 |
13 | 33a24b04 |
14 | 1d5d7773 |
15 | 131e2271 |
hex | c4f0ab9 |
206506681 has 2 divisors, whose sum is σ = 206506682. Its totient is φ = 206506680.
The previous prime is 206506661. The next prime is 206506723. The reversal of 206506681 is 186605602.
206506681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 187005625 + 19501056 = 13675^2 + 4416^2 .
It is a cyclic number.
It is not a de Polignac number, because 206506681 - 29 = 206506169 is a prime.
It is a super-2 number, since 2×2065066812 = 85290018595271522, which contains 22 as substring.
It is not a weakly prime, because it can be changed into another prime (206506621) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103253340 + 103253341.
It is an arithmetic number, because the mean of its divisors is an integer number (103253341).
Almost surely, 2206506681 is an apocalyptic number.
It is an amenable number.
206506681 is a deficient number, since it is larger than the sum of its proper divisors (1).
206506681 is an equidigital number, since it uses as much as digits as its factorization.
206506681 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 17280, while the sum is 34.
The square root of 206506681 is about 14370.3403230404. The cubic root of 206506681 is about 591.0778735436.
The spelling of 206506681 in words is "two hundred six million, five hundred six thousand, six hundred eighty-one".
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