911 (number)

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

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

← 910 911 912 →
Cardinalnine hundred eleven
Ordinal911th
(nine hundred eleventh)
Factorizationprime
PrimeYes
Greek numeralϠΙΑ´
Roman numeralCMXI
Binary11100011112
Ternary10202023
Octal16178
Duodecimal63B12
Hexadecimal38F16

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 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
  • 9-1-1, a North American emergency telephone number
  • 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.
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