Base | Representation |
---|---|
bin | 11100111110111… |
… | …00001101001101 |
3 | 121221110221002100 |
4 | 32133130031031 |
5 | 444214414041 |
6 | 40042545313 |
7 | 6011340321 |
oct | 1637341515 |
9 | 557427070 |
10 | 243123021 |
11 | 115266a19 |
12 | 69508239 |
13 | 3b4a549b |
14 | 24409981 |
15 | 165266b6 |
hex | e7dc34d |
243123021 has 12 divisors (see below), whose sum is σ = 351544960. Its totient is φ = 161912520.
The previous prime is 243123017. The next prime is 243123061. The reversal of 243123021 is 120321342.
243123021 is a `hidden beast` number, since 2 + 431 + 230 + 2 + 1 = 666.
It is not a de Polignac number, because 243123021 - 22 = 243123017 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 243122985 and 243123003.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (243123061) 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 in 11 ways as a sum of consecutive naturals, for example, 4711 + ... + 22548.
Almost surely, 2243123021 is an apocalyptic number.
It is an amenable number.
243123021 is a deficient number, since it is larger than the sum of its proper divisors (108421939).
243123021 is a wasteful number, since it uses less digits than its factorization.
243123021 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 28256 (or 28253 counting only the distinct ones).
The product of its (nonzero) digits is 288, while the sum is 18.
The square root of 243123021 is about 15592.4026692489. The cubic root of 243123021 is about 624.1304353194.
Adding to 243123021 its reverse (120321342), we get a palindrome (363444363).
It can be divided in two parts, 2431 and 23021, that added together give a palindrome (25452).
The spelling of 243123021 in words is "two hundred forty-three million, one hundred twenty-three thousand, twenty-one".
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