Base | Representation |
---|---|
bin | 1111001100111001… |
… | …00011101011000001 |
3 | 210001202202120201122 |
4 | 13212130203223001 |
5 | 113203232304441 |
6 | 3425455042025 |
7 | 406146111155 |
oct | 74634435301 |
9 | 23052676648 |
10 | 8161213121 |
11 | 3508879236 |
12 | 16b9210315 |
13 | a00a69ab9 |
14 | 575c71065 |
15 | 32b74234b |
hex | 1e6723ac1 |
8161213121 has 2 divisors, whose sum is σ = 8161213122. Its totient is φ = 8161213120.
The previous prime is 8161213097. The next prime is 8161213133. The reversal of 8161213121 is 1213121618.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 8049678400 + 111534721 = 89720^2 + 10561^2 .
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-8161213121 is a prime.
It is a Sophie Germain prime.
It is a Curzon number.
It is not a weakly prime, because it can be changed into another prime (8161213141) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4080606560 + 4080606561.
It is an arithmetic number, because the mean of its divisors is an integer number (4080606561).
Almost surely, 28161213121 is an apocalyptic number.
It is an amenable number.
8161213121 is a deficient number, since it is larger than the sum of its proper divisors (1).
8161213121 is an equidigital number, since it uses as much as digits as its factorization.
8161213121 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 576, while the sum is 26.
The square root of 8161213121 is about 90339.4328131409. The cubic root of 8161213121 is about 2013.3451817540.
Adding to 8161213121 its reverse (1213121618), we get a palindrome (9374334739).
The spelling of 8161213121 in words is "eight billion, one hundred sixty-one million, two hundred thirteen thousand, one hundred twenty-one".
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