1001

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1001 < 1000 | 1002 >
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1000	1001	1002	1003	1004	1005	1006	1007	1008	1009
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1001 is the number following 1000 and preceding 1002.

Properties

• Its factors are 1, 7, 11, 13, 77, 91, 143 and 1001, making it a composite number. It is also a squarefree number.
• 1001 is an odd number .
• 1001 is an unhappy number.
  

• 1001 is a pentagonal number.
  
• 1001 is deficient.
  
• Its prime factorization is 7¹ × 11¹ × 13¹.
  
• 1001 is a palindromic number, meaning it is the same forwards and reverse.
  

Approximations

Notation	Lower bound	Upper bound
Up-arrow notation	10 ↑ 3
Scientific notation	1.001 x 103	1.002 x 103
Slow-growing hierarchy	\(g_{\omega^{\omega}}(4)\)	\(g_{\omega^{\omega}}(5)\)
Copy notation	9[3]	10[2]
Chained arrow notation	10 → 3
Bowers' Exploding Array Function/Bird's array notation	{10,3}
Fast-growing hierarchy	f2(7)	f2(8)
Hardy hierarchy	Hω(500)	Hω(501)
Middle-growing hierarchy	m(ω,9)	m(ω,10)
Hyper-E notation	E3.0004
Hyper-E notation (non-10 base)	\(E[10]3\)
Hyperfactorial array notation	6!	7!
X-Sequence Hyper-Exponential Notation	10{1}3
Steinhaus-Moser Notation	4[3]	5[3]
PlantStar's Debut Notation	[1]	[2]
H* function	H(0)	H(0.1)
Bashicu matrix system with respect to version 4	(0)[31]	(0)[32]
m(n) map	m(1)(4)	m(1)(5)
s(n) map	\(s(1)(\lambda x . x+1)(499)\)	\(s(1)(\lambda x . x+1)(500)\)