51 (number) facts for kids
Quick facts for kids
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|---|---|---|---|---|
| Cardinal | fifty-one | |||
| Ordinal | 51st (fifty-first) |
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| Factorization | 3 × 17 | |||
| Divisors | 1, 3, 17, 51 | |||
| Greek numeral | ΝΑ´ | |||
| Roman numeral | LI | |||
| Binary | 1100112 | |||
| Ternary | 12203 | |||
| Senary | 1236 | |||
| Octal | 638 | |||
| Duodecimal | 4312 | |||
| Hexadecimal | 3316 | |||
Fifty-one is a number. It comes right after fifty and just before fifty-two. It is an odd number, which means it cannot be divided evenly by two.
Contents
What is the Number 51?
The number 51 is a natural number, which are the numbers we use for counting. It is also a composite number. This means it has more than two divisors (numbers that divide into it without a remainder). The divisors of 51 are 1, 3, 17, and 51.
Math Fun with 51
Fifty-one has some interesting properties in mathematics.
Divisors and Number Types
Since 51 can be divided by 3 and 17, it is a semiprime number. A semiprime number is a number that is the product of two prime numbers. In this case, 3 and 17 are both prime numbers, and 3 multiplied by 17 equals 51.
Fifty-one is also a deficient number. To find out if a number is deficient, you add up all its divisors, but you do not include the number itself. For 51, the divisors are 1, 3, and 17. If you add them (1 + 3 + 17), you get 21. Since 21 is less than 51, it is a deficient number.
Special Number Properties
The number 51 is a pentagonal number. You can arrange dots to form a shape with five sides (a pentagon) using this number of dots. It is the fifth pentagonal number.
It is also a centered pentagonal number. This means you can arrange dots in a pentagon shape with one dot in the center, and then layers of pentagons around it.
51 in the World Around Us
The number 51 appears in many different places, from science to popular culture.
Science and Geography
In chemistry, 51 is the atomic number of the element Antimony. Antimony is a shiny, gray metal that is used in things like batteries and flame retardants.
If you want to call someone in Peru from another country, you would use +51 as the International dialing code. This code helps phone systems know where to send your call.
Sports and Culture
In sports, 51 is often seen as a jersey number for players. It can also be a score in games like basketball or football.
You might have heard of "Area 51." This is a secret United States Air Force facility in Nevada. It is famous for being a place where people believe unusual things, like unidentified flying objects (UFOs), might be studied.
Images for kids
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A robot for kids.
See also
