911 (number)
911 is the integer following 910 and preceding 912.
It is a prime number, a Sophie Germain prime, and the sum of three consecutive primes. 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.
There are 911 inverse semigroups of order 7
911 is obtained by concatenating its product of digits and sum of digits.