911 (number)

This article is about the numeric value. For the phone number, see 911 (emergency telephone number). 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
Senary41156
Octal16178
Duodecimal63B12
Hexadecimal38F16

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

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 . 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.

  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.