Base | Representation |
---|---|
bin | 10011100110001001001 |
3 | 1012121211021 |
4 | 2130301021 |
5 | 131021441 |
6 | 21432441 |
7 | 5313034 |
oct | 2346111 |
9 | 1177737 |
10 | 642121 |
11 | 3a9487 |
12 | 26b721 |
13 | 19636c |
14 | 12a01b |
15 | ca3d1 |
hex | 9cc49 |
642121 has 2 divisors, whose sum is σ = 642122. Its totient is φ = 642120.
The previous prime is 642113. The next prime is 642133. The reversal of 642121 is 121246.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 622521 + 19600 = 789^2 + 140^2 .
It is a cyclic number.
It is not a de Polignac number, because 642121 - 23 = 642113 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 642095 and 642104.
It is not a weakly prime, because it can be changed into another prime (642151) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321060 + 321061.
It is an arithmetic number, because the mean of its divisors is an integer number (321061).
2642121 is an apocalyptic number.
It is an amenable number.
642121 is a deficient number, since it is larger than the sum of its proper divisors (1).
642121 is an equidigital number, since it uses as much as digits as its factorization.
642121 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 96, while the sum is 16.
The square root of 642121 is about 801.3245285151. The cubic root of 642121 is about 86.2724817121.
Adding to 642121 its reverse (121246), we get a palindrome (763367).
The spelling of 642121 in words is "six hundred forty-two thousand, one hundred twenty-one".
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