9

Previous number

8

Next number

10

Sum of digits

9

Divisors of 9

Number of divisors

3

Sum of divisors

13

Factorization

9 = 3 × 3

Prime factors of 9

Factor Count
3 2

Square of 9

81

Cube of 9

729

Square root of 9

3

Cube root of 9

2.08008382305190409056194766890258...

9th triangle number

45

Reciprocal of 9

0.1111111111111111

Binary of 9

1001

Number of digits of 9 in base 2

4

Octal of 9

11

Hexadecimal of 9

9

Prime number No
Hexagonal number No
Perfect number No
Deficient number Yes
Abundant number No
Mersenne number No
Harshad number Yes
Harmonic divisor number No

Quadratic residues of 9

QR9 (sequence)

9th composite number

16

Euler's totient function of 9

6

Carmichael function of 9

6

Möbius function of 9

0

Properties of 9

Properties of the number 9: 9 has 3 divisors. The divisors of 9 are 1, 3, 9 and the sum of them is 13. The factorization of 9 is 3 × 3. The square and cube of 9 are 81 and 729 respectively. The square root and cube root of 9 are 3 and 2.08008382305190409056194766890258.... The binary, octal, hexadecimal of 9 are 1001, 11, 9. 9 is not a prime number, not hexagonal number, not perfect number, deficient number, not Mersenne number, not Mersenne number, Harshad number, not harmonic divisor number.

sin 9

0.41211848524175659358448342572956...

cos 9

-0.91113026188467693966543947681203...

tan 9

-0.45231565944180984750744300981751...

sin 9°

0.15643446504023086895962535436411...

cos 9°

0.98768834059513777035022030759137...

tan 9°

0.15838444032453627419165798073664...

log 9

2.19722457733621956421643517387565...

log10 9

0.95424250943932487079024440390640...

log2 9

3.16992500144231215131185308564454...

Related pairs