Base | Representation |
---|---|
bin | 1001101100111… |
… | …10100111010001 |
3 | 12200011001010200 |
4 | 10312132213101 |
5 | 131313440113 |
6 | 12024245413 |
7 | 2005542504 |
oct | 466364721 |
9 | 180131120 |
10 | 81390033 |
11 | 41a4059a |
12 | 23310869 |
13 | 13b28caa |
14 | ab4913b |
15 | 722a873 |
hex | 4d9e9d1 |
81390033 has 24 divisors (see below), whose sum is σ = 126840168. Its totient is φ = 50099712.
The previous prime is 81390019. The next prime is 81390061. The reversal of 81390033 is 33009318.
It can be written as a sum of positive squares in 4 ways, for example, as 23736384 + 57653649 = 4872^2 + 7593^2 .
It is not a de Polignac number, because 81390033 - 213 = 81381841 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 81389979 and 81390006.
It is not an unprimeable number, because it can be changed into a prime (81390073) by changing a digit.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3091 + ... + 13127.
It is an arithmetic number, because the mean of its divisors is an integer number (5285007).
Almost surely, 281390033 is an apocalyptic number.
It is an amenable number.
81390033 is a deficient number, since it is larger than the sum of its proper divisors (45450135).
81390033 is a wasteful number, since it uses less digits than its factorization.
81390033 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 10113 (or 10110 counting only the distinct ones).
The product of its (nonzero) digits is 1944, while the sum is 27.
The square root of 81390033 is about 9021.6424779527. The cubic root of 81390033 is about 433.3682345985.
It can be divided in two parts, 8 and 1390033, that added together give a square (1390041 = 11792).
The spelling of 81390033 in words is "eighty-one million, three hundred ninety thousand, thirty-three".
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