Number: 81

Previous Number: 80
Next Number: 82
Absolute: 81
Sign: positive
Even or Odd: Odd
Length: 2 digits (Significant Figures, Sig Fig)
Counter: -81
Inverse: 0.012345679012346
Reverse: 18 ; Palindromic: No
Half: 40.5
Double: 162
Undulating: Yes
Fibonacci: No
Fibonacci Prime: No
Evil or Odious: Odious
Lucas: No
Narcissistic: No
Pell: No
Octagonal: No
Centered Octagonal: Yes ; Previous: 49 ; Next: 121
Untouchable: No
Valid phone number (US)?: No
Valid SSN (US)?: No
Human Readable Size (Kilo: 1000): 81B
Human Readable Size (Kibi: 1024): 81B
UNIX Time Stamp: 1970-01-01 00:01:21
HTTP Status Code: Invalid
Digits in English (and NATO IPA): eight one
Digits in Morse Code: ---.. .----
Square Root: 9
Sine: -0.62988799427445
Cosine: 0.77668598202163
Tangent: -0.81099441583189
Inverse Tangent: 1.5584512749507
Secant: -1.5875838388567
Cosecant: 1.2875216279778
Cotangent: -1.2330541129241
Inverse Cotangent: 0.64166266605393
Roman Number: LXXXI

Number: 81


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