911 (number)

This article is about the numeric value. For the phone number, see 9-1-1. For other numeric terms, see 911 (disambiguation).

911 (nine hundred [and] eleven) is the integer following 910 and preceding 912.

← 910 911 912 →
List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	nine hundred eleven
Ordinal	911th (nine hundred eleventh)
Factorization	prime
Prime	Yes
Greek numeral	ϠΙΑ´
Roman numeral	CMXI
Binary	11100011112
Ternary	10202023
Senary	41156
Octal	16178
Duodecimal	63B12
Hexadecimal	38F16

It is a prime number, a Sophie Germain prime, and the sum of three consecutive primes (293 + 307 + 311). It is an Eisenstein prime with no imaginary part and real part of the form ${\displaystyle 3n-1}$. Since 913 is a semiprime, 911 is a Chen prime. It is also a centered decagonal number.^[1]

There are 911 inverse semigroups of order 7 (sequence A001428 in the OEIS)

911 is obtained by concatenating its product of digits and sum of digits.

See also

• 9/11, the September 11 attacks of 2001
• AD 911, a year
• Porsche 911, a sports car

References

1. Sloane, N. J. A. (ed.). "Sequence A062786 (Centered 10-gonal numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved June 2, 2016.