Discover a lot of information on the number 1: properties, mathematical operations, how to write it, symbolism, numerology, representations and many other interesting things!

## Numerology and symbolism of the number 1

The number 1 (one) represents the uniqueness, the unique, a starting point, a beginning.

## Mathematical properties of 1

Is 1 a prime number? Yes
Is 1 a perfect number? No
Number of divisors 1
List of dividers 1
Sum of divisors 1
Prime factorization 1
Prime factors 1

## How to write / spell 1 in letters?

In letters, the number 1 is written as: One. And in other languages? how does it spell?

1 in other languages
Write 1 in english One
Write 1 in french Un
Write 1 in spanish Uno
Write 1 in portuguese Um

Other ways to write 1
In letter One
In roman numeral I
In binary 1
In octal 1
In US dollars USD 1.00 (\$)
In euros 1,00 EUR (€)
Some related numbers
Previous number 0
Next number 2
Next prime number 2

## Mathematical operations

Operations and solutions
1*2 = 2 The double of 1 is 2
1*3 = 3 The triple of 1 is 3
1/2 = 0.5 The half of 1 is 0.500000
1/3 = 0.33333333333333 The third of 1 is 0.333333
12 = 1 The square of 1 is 1.000000
13 = 1 The cube of 1 is 1.000000
√1 = 1 The square root of 1 is 1.000000
log(1) = 0 The natural (Neperian) logarithm of 1 is 0.000000
log10(1) = 0 The decimal logarithm (base 10) of 1 is 0.000000
sin(1) = 0.8414709848079 The sine of 1 is 0.841471
cos(1) = 0.54030230586814 The cosine of 1 is 0.540302
tan(1) = 1.5574077246549 The tangent of 1 is 1.557408