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A number is called a sunny number if the number next to the given number is a perfect square. In other words, a number N will be a sunny number if N+1 is a perfect square.

## What is fascinating number in Java?

Multiplying a number by two and three separately, the number obtained by writing the results obtained with the given number will be called a fascinating number. If the result obtained after concatenation contains all digits from 1 to 9, exactly once.

## What is unique number in Java?

The number will be unique if it is positive integer and there are no repeated digits in the number. In other words, a number is said to be unique if and only if the digits are not duplicate. For example, 20, 56, 9863, 145, etc. are the unique numbers while 33, 121, 900, 1010, etc.

## What is Nelson number in Java?

The number 111 is called a nelson number and multiples of nelson are called double Nelson (222), triple Nelson (333), and so on. It is important to note that only few multiples of 111 are called Nelson numbers. These numbers are 111, 222, 333, 444, 555, 666, 777, 888, and 999.

## What are the different types of numbers in Java?

Primitive Data Types

Data Type | Size | Description |
---|---|---|

byte | 1 byte | Stores whole numbers from -128 to 127 |

short | 2 bytes | Stores whole numbers from -32,768 to 32,767 |

int | 4 bytes | Stores whole numbers from -2,147,483,648 to 2,147,483,647 |

long | 8 bytes | Stores whole numbers from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 |

## What is bouncy number in Java?

A positive integer that is neither in increasing nor decreasing number is called a bouncy number. It means they bounce between increasing and decreasing. In other words, we can say that if the digits of the number are unsorted. For example, 123742, 101, 43682, etc.

## Is 273 a fascinating number?

Consider the number 273. Following are the multiples of 2 and 3 of the number 273. Concatenating all the numbers, we get the final number 273546819. This is a fascinating number since it contains all the digits 1 to 9 exactly once!

## What is Duck number in Java?

Duck number is another special positive non-zero number that contains zero in it. The digit zero should not be presented at the starting of the number. Zero can be present at any of the positions except the beginning of the number.

## What is a sad number?

The numbers for which the process of summing up of the squares of its digits ends in 1 are happy numbers. On the other hand, numbers that don’t end in 1 are called unhappy or sad numbers. … Here, the number 36 loops endlessly in a cycle which doesn’t end in 1. Therefore 36 is an unhappy or sad number.

## What is Smith number in Java?

A composite number whose sum of digits equal to the sum of the digits of its prime factors.

## What is Kaprekar number in Java?

A Kaprekar number for a given base is a non-negative integer, the representation of whose square in that base can be split into two parts that add up to the original number again. For instance, 45 is a Kaprekar number, because 45^{2} = 2025 and 20+25 = 45.

## What is Spy number?

A spy number is a number where the sum of its digits equals the product of its digits. For example, 1124 is a spy number, the sum of its digits is 1+1+2+4=8 and the product of its digits is 1*1*2*4=8.

## What is Deserium number?

Deserium Number: A number is said to be Deserium number if the sum of the digits of a number with respect to the power of from 1 to the number of digits is equal to the number itself is known as Deserium Number.

## Which are co prime numbers?

Co-prime numbers are the numbers whose common factor is only 1. There should be a minimum of two numbers to form a set of co-prime numbers. Such numbers have only 1 as their highest common factor, for example, {4 and 7}, {5, 7, 9} are co-prime numbers.

## What is Emirp number in Java?

A number is called an emirp number if we get another prime number on reversing the number itself. In other words, an emirp number is a number that is prime forwards or backward. It is also known as twisted prime numbers.