Base | Representation |
---|---|
bin | 1100001101011… |
… | …01000100101101 |
3 | 21010201111220021 |
4 | 12012231010231 |
5 | 202204431111 |
6 | 14055122141 |
7 | 2352363601 |
oct | 606550455 |
9 | 233644807 |
10 | 102420781 |
11 | 528a5281 |
12 | 2a373351 |
13 | 182b0618 |
14 | d861501 |
15 | 8ed1d71 |
hex | 61ad12d |
102420781 has 2 divisors, whose sum is σ = 102420782. Its totient is φ = 102420780.
The previous prime is 102420763. The next prime is 102420853. The reversal of 102420781 is 187024201.
It is a happy number.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 78322500 + 24098281 = 8850^2 + 4909^2 .
It is a cyclic number.
It is not a de Polignac number, because 102420781 - 25 = 102420749 is a prime.
It is a super-2 number, since 2×1024207812 = 20980032761299922, which contains 22 as substring.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (102420701) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51210390 + 51210391.
It is an arithmetic number, because the mean of its divisors is an integer number (51210391).
Almost surely, 2102420781 is an apocalyptic number.
It is an amenable number.
102420781 is a deficient number, since it is larger than the sum of its proper divisors (1).
102420781 is an equidigital number, since it uses as much as digits as its factorization.
102420781 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 896, while the sum is 25.
The square root of 102420781 is about 10120.3152618878. The cubic root of 102420781 is about 467.8744838967.
Adding to 102420781 its reverse (187024201), we get a palindrome (289444982).
The spelling of 102420781 in words is "one hundred two million, four hundred twenty thousand, seven hundred eighty-one".
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