Base | Representation |
---|---|
bin | 1001110101011… |
… | …10111111010001 |
3 | 12202020201111222 |
4 | 10322232333101 |
5 | 132110140211 |
6 | 12104214425 |
7 | 2021200226 |
oct | 472567721 |
9 | 182221458 |
10 | 82505681 |
11 | 42632815 |
12 | 2376a415 |
13 | 14129a3b |
14 | ad5994d |
15 | 739b1db |
hex | 4eaefd1 |
82505681 has 2 divisors, whose sum is σ = 82505682. Its totient is φ = 82505680.
The previous prime is 82505639. The next prime is 82505701. The reversal of 82505681 is 18650528.
It is a happy number.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 81993025 + 512656 = 9055^2 + 716^2 .
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-82505681 is a prime.
It is a super-2 number, since 2×825056812 = 13614374794547522, which contains 22 as substring.
It is not a weakly prime, because it can be changed into another prime (82505081) 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, 41252840 + 41252841.
It is an arithmetic number, because the mean of its divisors is an integer number (41252841).
Almost surely, 282505681 is an apocalyptic number.
It is an amenable number.
82505681 is a deficient number, since it is larger than the sum of its proper divisors (1).
82505681 is an equidigital number, since it uses as much as digits as its factorization.
82505681 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 19200, while the sum is 35.
The square root of 82505681 is about 9083.2637856665. The cubic root of 82505681 is about 435.3393766777.
It can be divided in two parts, 8250 and 5681, that added together give a palindrome (13931).
The spelling of 82505681 in words is "eighty-two million, five hundred five thousand, six hundred eighty-one".
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