There's no single "most unpopular number," but 13 is famously unlucky in Western cultures (triskaidekaphobia), while in Japan, the number 4 is avoided due to its pronunciation sounding like "death" (tetraphobia), and in Afghanistan, 39 is considered unlucky because it translates to "dead cow" (pimp). Conversely, some mathematicians debate the "most boring" number, with 1729 (Hardy-Ramanujan number) or 39 (as the first uninteresting number) being contenders for being unexciting.
The number 13 is considered an unlucky number in some countries. The end of the Mayan calendar's 13th Baktun was superstitiously feared as a harbinger of the apocalyptic 2012 phenomenon. Fear of the number 13 has a specifically recognized phobia, triskaidekaphobia, a word first recorded in 1911.
Quintillion is the denomination used for large numbers. A quintillion is the number name for 10 raised to the power of 18, that is, one followed by 18 zeros. In the International numeral system, a quintillion has 6 groups of zeros in 3, that is, 1,000,000,000,000,000,000.
Did you know that there are numbers that are exactly divisible by all the numbers from 1 - 10? The number 2520, is the smallest number which is exactly divisible by all the numbers from 1 - 10.
This sequence does not extend above 52 because it is, an untouchable number, since it is never the sum of proper divisors of any number. It is the first untouchable number larger than 2 and 5.
142857 is the best-known cyclic number in base 10, being the six repeating digits of 1/7 (0. 142857).
Abstract. The numbers that give a perfect square on adding as well as subtracting their reverse are rare, like 65, 621770, etc. and hence have been termed as rare numbers by the author. This chapter is extensively devoted to computing and investigating rare numbers up to 1024.
1729 is the natural number following 1728 and preceding 1730. It is the first nontrivial taxicab number, expressed as the sum of two cubic positive integers in two different ways. It is known as the Ramanujan number or Hardy–Ramanujan number after G. H. Hardy and Srinivasa Ramanujan.
Using this algorithm with hand computations on paper, Lucas showed in 1876 that the 39-digit number (2127 – 1) equals 170,141,183,460,469,231,731,687,303,715,884,105,727, and that value is prime. Also known as M127, this number remains the largest prime verified by hand computations.
A unit of quantity equal to 1051 (1 followed by 51 zeros).
The number 12,345,678,910,987,654,321 is indeed prime. It consists of 20 digits and is really easy to remember: count to 10 and then count backward again until you get to 1. But it has been unclear whether other primes take the palindromic form of starting at 1, ascending to the number n and then descending again.
Number of the beast
In modern popular culture, 666 has become one of the most widely recognized symbols for the Antichrist or, alternatively Satanism. Earnest references to the number occur both among apocalypticist Christian groups and in explicitly anti-Christian subcultures.
We associate the number 1 with agency and autonomy—stereotypically male traits. The associations we have with 2—relationships, community, caregiving—are more feminine and seem to extend to all even numbers. We use concrete metaphors to understand abstract concepts.
Due to the superstitious significance of the numbers it contains, the palindromic prime 1000000000000066600000000000001 is known as Belphegor's Prime, named after Belphegor, one of the seven princes of Hell.
The number 42 is, in The Hitchhiker's Guide to the Galaxy by Douglas Adams, the "Answer to the Ultimate Question of Life, the Universe, and Everything", calculated by an enormous supercomputer named Deep Thought over a period of 7.5 million years.
Final Answer:
The expression 2×3×5×7+1 equals 211, which is a prime number, not a composite number.
The number 7 is divisible only by 1 and the number itself. For a number to be classified as a prime number, it should have exactly two factors. Since 7 has exactly two factors, i.e. 1 and 7, it is a prime number.
It is a square number (33 squared), a nonagonal number, a 32-gonal number, a 364-gonal number, and a centered octagonal number. 1089 is the first reverse-divisible number. The next is 2178 (= 1089 × 2 = 8712/4), and they are the only four-digit numbers that divide their reverse.
No, because the only proper factors of 52 are 2, 4, 13, and 26, and none of these factors gives 52 when multiplied by itself.