1 Number Properties & Facts

One

Primality

Prime Factorization of 1
Number of Divisors of 1
1
1
Is 1 Prime?
No

Trigonometry

Sine of 1
0.8414709848079
Cosecant: 1.1883951057781
Cosine of 1
0.54030230586814
Secant: 1.8508157176809
Tangent of 1
1.5574077246549
Cotangent: 0.64209261593433

Functions

Square of 1
1
1 × 1 = 1
Square Root of 1
1
12 = 1
Natural Logarithm (ln) of 1
0
e0 = 1
Decimal Logarithm (log) of 1
0
100 = 1

Sequences

Is 1 a Fibonacci Number?
Yes: F2
Is 1 a Bell Number?
Yes: B1
Is 1 a Catalan Number?
Yes: C0, C1
Is 1 a Factorial?
Yes: 1!
Is 1 a Perfect Number?
No

Numeric Bases

1 in Binary (Base 2)
0b1
One's Complement: 0
Two's Complement: 1
1 in Octal (Base 8)
01
1 in Hexadecimal (Base 16)
0x1

Miscellaneous

  • 1 is an odd number
  • 1 has 1 Significant Figures
  • The Hamming Weight of 1 is 1
  • 1 is a Hamming (Regular) Number
  • 1 is a Humble Number
  • 1 is a Polygonal (s < 13) Number: Triangular (1), Square (1), Pentagonal (1), Hexagonal (1), Heptagonal (1), Octagonal (1), Nonagonal (1), Decagonal (1), Hendecagonal (1), Dodecagonal (1)
  • 1 is a Happy Number
  • 1 is not a Self Describing Number
  • 1 is a Palindrome
  • 1 is a Münchhausen Number
  • 1 is not an Eban Number
  • 1 is a Pernicious Number
  • 1 is an Attractive Number
  • 1 is a Perfect Square
  • 1 is a Perfect Power