# 13

## 13 is a prime number. Like all primes greater than two, it is odd and has no factors apart from itself and one.

PRIME

What does the number 13 look like?

As a prime, it is not composed of any other numbers and has no internal structure.

13 is a prime number. Like all primes (except two), it is an odd number.

## Prime factorization of 13:

### 13

See below for interesting mathematical facts about the number 13 from the Numbermatics database.

Quick links:

Names Factors Divisors Bases Roots Scales Fun

### Names of 13

- Cardinal: 13 can be written as
**Thirteen.**

### Scientific notation

- Scientific notation: 1.3 × 10
^{1}

### Factors of 13

- Number of distinct prime factors ω(
*n*): 1
- Total number of prime factors Ω(
*n*): 1
- Sum of prime factors: 13

### Divisors of 13

- Number of divisors
*d(n)*: 2
- Complete list of divisors:
- Sum of all divisors σ(
*n*): 14
- Sum of proper divisors (its aliquot sum) s(
*n*): 1
- 13 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 12

### Bases of 13

- Binary: 1101
_{2}
- Hexadecimal: 0xD
- Base-36: D

### Squares and roots of 13

- 13 squared (13
^{2}) is 169
- 13 cubed (13
^{3}) is 2197
- The square root of 13 is 3.6055512755
- The cube root of 13 is 2.3513346877

### Scales and comparisons

How big is 13?

**A cube with a volume of 13 cubic inches would be around 0.2 feet tall.**

### Recreational maths with 13

- 13 backwards is 31
- The number of decimal digits it has is: 2
- The sum of 13's digits is 4
- More coming soon!