43

43
Basic Information
Cardinal Number	forty-three
Ordinal Number	forty third
Roman Numeral	XLIII
Greek Numeral	ΜΓ´
Factorization	43
Standard Form	4.3 × 101
Different Representations
Binary Form	1010112
Ternary Form	11213
Quaternary Form	2234
Quinary Form	1335
Senary Form	1116
Septenary Form	617
Octal Form	538
Nonary Form	479
Undecimal Form	3A11
Duodecimal Form	3712
Tridecimal Form	3413
Quattuordecimal Form	3114
Quindecimal Form	2D15
Hexadecimal Form	2B16
Septendecimal Form	2917
Octodecimal Form	2718
Novemdecimal Form	2519
Vigesimal Form	2320
Unvigesimal Form	2121
Duovigesimal Form	1L22
Trevigesimal Form	1K23
Quattuorvigesimal Form	1J24
Quinvigesimal Form	1I25
Hexavigesimal Form	1H26
Septenvigesimal Form	1G27
Octovigesimal Form	1F28
Novemvigesimal Form	1E29
Trigesimal Form	1D30
Untrigesimal Form	1C31
Duotrigesimal Form	1B32
Tretrigesimal Form	1A33
Quattuortrigesimal Form	1934
Quintrigesimal Form	1835
Hexatrigesimal Form	1736
Previous	41
Current	43
Next	47

43 is a prime number from 1-100. 43 has 2 factors, 1 and 43. It is the fourteenth prime number, and the fourteenth prime number from 1-100. It is also the smallest prime to not have a chen prime since 45 is neither prime nor semiprime. The primorial of 43 is 13,082,761,331,670,030.

Proofs

• — 43 is divisible by 1.

• — 43 is not divisible by 2-42.

• — 43 is divisible by 43.

• Therefore, 43 has two factors.

As an Exponent of Mersenne Number

2⁴³ - 1, which is the number 8,796,093,022,207, is divisible by numbers such as 431, 9,719, and 2,099,863 and therefore not a prime number.

Relationship with other odd numbers

The numbers before

• The previous odd number, 41, is a prime number.
  • There are no odd numbers between 41 and 43. As a result, they are twin primes.
• The previous odd number, 39, is not a prime number. It is divisible by 3 and 13.
• The odd number previous to 39 is 37. 37 is a prime number.
  • 37 and 43 are six numbers apart; therefore, they are sexy primes.

The numbers after

• The next odd number, 45, is not a prime number. It is divisible by 5 and 9.
• 47, the odd number following 45, is a prime number.
  • 43 and 47 are four numbers apart; therefore, they are cousin primes.
• 49, the odd number following 47, is not a prime number. It is the square number, being 7² = 49.

Prime Numbers 1-1,000