Base | Representation |
---|---|
bin | 1001101010110… |
… | …10100001001110 |
3 | 12122121212112111 |
4 | 10311122201032 |
5 | 131231023433 |
6 | 12014254234 |
7 | 2003301364 |
oct | 465324116 |
9 | 178555474 |
10 | 81111118 |
11 | 4186aa90 |
12 | 231b737a |
13 | 13a5c05a |
14 | aab5634 |
15 | 71c2dcd |
hex | 4d5a84e |
81111118 has 16 divisors (see below), whose sum is σ = 133030656. Its totient is φ = 36784440.
The previous prime is 81111101. The next prime is 81111119.
81111118 is nontrivially palindromic in base 10.
It is a Harshad number since it is a multiple of its sum of digits (22).
81111118 is a strobogrammatic number because it is the same when read upside-down.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (81111119) 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 in 7 ways as a sum of consecutive naturals, for example, 6205 + ... + 14167.
It is an arithmetic number, because the mean of its divisors is an integer number (8314416).
Almost surely, 281111118 is an apocalyptic number.
81111118 is a deficient number, since it is larger than the sum of its proper divisors (51919538).
81111118 is a wasteful number, since it uses less digits than its factorization.
81111118 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 8439.
The product of its digits is 64, while the sum is 22.
The square root of 81111118 is about 9006.1711065247. The cubic root of 81111118 is about 432.8726324016.
It can be divided in two parts, 8111 and 1118, that added together give a palindrome (9229).
The spelling of 81111118 in words is "eighty-one million, one hundred eleven thousand, one hundred eighteen".
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