911 (number) explained

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

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

References

1. A062786. Centered 10-gonal numbers. 2016-06-02.