Number 15 in British English words is fifteen.
Number consists of 2 digits, two-digit.

Number 15 in American English words is fifteen, in German words is fünfzehn, in French words is quinze, in Spanish words is quince, in Italian words is quindici, in Dutch words is vijftien, in Danish words is femten.
If you want to write in words the number 15, it is necessary to use 7 characters.

Number 15 in binary code can be written 1111.

Number 15 in octal code can be written 17.

Number 15 in hexadecimal code can be written F.

Number 15 in Roman numerals is XV.

Unix timestamp 15 converted to human readable date and time is Thursday January 1, 1970, 3:00 AM.

Decimal IP address 15 converted to dotted-decimal format is 0.0.0.15.

The square root of 15 is 3.8729833462074.
Number 15 multiplied by 2 equals 30.
Divided by 2 equals 7.5.
The sum of all digits equals 6.
Number 15 raised to the power of 2 is 225.
Number 15 raised to the power of 3 is 3375.

The cosine of number 15 is -0.75968791285882.
The sine of number 15 is 0.65028784015712.
The tangent of number 15 is -0.85599340090852.
The radian equivalent of number 15 is 0.26179938779915.
The equivalent of number 15 in degrees is 859.43669269623.
The base-10 logarithm of number 15 is 1.1760912590557.

This number is odd number (an integer that is not evenly divisible by 2).
Number 15 is not a prime number.