Base | Representation |
---|---|
bin | 1011111010111… |
… | …10000101010001 |
3 | 20222011112022201 |
4 | 11331132011101 |
5 | 201100000311 |
6 | 13531203201 |
7 | 2322662266 |
oct | 575360521 |
9 | 228145281 |
10 | 100000081 |
11 | 514a15a5 |
12 | 295a6501 |
13 | 1794385c |
14 | d3d126d |
15 | 8ba49c1 |
hex | 5f5e151 |
100000081 has 2 divisors, whose sum is σ = 100000082. Its totient is φ = 100000080.
The previous prime is 100000073. The next prime is 100000123. The reversal of 100000081 is 180000001.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 100000000 + 81 = 10000^2 + 9^2 .
It is a cyclic number.
It is not a de Polignac number, because 100000081 - 23 = 100000073 is a prime.
It is a super-2 number, since 2×1000000812 = 20000032400013122, which contains 22 as substring.
It is not a weakly prime, because it can be changed into another prime (100001081) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50000040 + 50000041.
It is an arithmetic number, because the mean of its divisors is an integer number (50000041).
Almost surely, 2100000081 is an apocalyptic number.
It is an amenable number.
100000081 is a deficient number, since it is larger than the sum of its proper divisors (1).
100000081 is an equidigital number, since it uses as much as digits as its factorization.
100000081 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 8, while the sum is 10.
The square root of 100000081 is about 10000.0040499992. The cubic root of 100000081 is about 464.1590086841.
Adding to 100000081 its reverse (180000001), we get a palindrome (280000082).
It can be divided in two parts, 1000000 and 81, that multiplied together give a square (81000000 = 90002).
The spelling of 100000081 in words is "one hundred million, eighty-one", and thus it is an aban number.
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