119 (number)

← 118 119 120 →
← 110 111 112 113 114 115 116 117 118 119 → List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	one hundred nineteen
Ordinal	119th (one hundred nineteenth)
Factorization	7 × 17
Divisors	1, 7, 17, 119
Greek numeral	ΡΙΘ´
Roman numeral	CXIX, cxix
Binary	11101112
Ternary	111023
Senary	3156
Octal	1678
Duodecimal	9B12
Hexadecimal	7716

119 (one hundred [and] nineteen) is the natural number following 118 and preceding 120.

Mathematics

• 119 is a Perrin number, preceded in the sequence by 51, 68, 90 (it is the sum of the first two mentioned). ^[1]
• 119 is the sum of five consecutive primes (17 + 19 + 23 + 29 + 31).
• 119 is the sum of seven consecutive primes (7 + 11 + 13 + 17 + 19 + 23 + 29).
• 119 is a highly cototient number. ^[2]
• 119 is one of five numbers to hold a sum-of-divisors of 144 = 12 ² (the others are 66, 70, 94, and 115). ^[3]
• 119 is the order of the largest cyclic subgroups of the monster group. ^[4]
• 119 is the smallest composite number that is 1 less than a factorial (120 is 5!). ^[5]
• 119 is a semiprime, and the fourth in the {7×q} family. ^[6]

Telephony

• 119 is an emergency telephone number in some countries
• A number to report youth at risk in France ^[7]
• 119 is the emergency number in Afghanistan that belongs to police and interior ministry.
• The South Korean emergency call number
• The Chinese fire station call number
• 119 is the number for the UK's NHS Test and Trace service (created in response to the COVID-19 pandemic)

References

1. "Sloane's A001608 : Perrin sequence". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 27 May 2016.
2. "Sloane's A100827 : Highly cototient numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 27 May 2016.
3. Sloane, N. J. A. (ed.). "SequenceA000203(Sum of divisors of n.)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 11 July 2024.
4. J. H. Conway et al.: Atlas of Finite Groups. Clarendon Press, Oxford, 1985. ISBN   0-19-853199-0 (Page 223)
5. Sloane, N. J. A. (ed.). "SequenceA033312(a(n) = n! - 1)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
6. Sloane, N. J. A. (ed.). "SequenceA001358(Semiprimes (or biprimes): products of two primes.)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
7. Descriptive website