It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is an Ulam number.
It is a Duffinian number.
1919 is an undulating number in base 10.
It is a plaindrome in base 8, base 12 and base 16.
It is a nialpdrome in base 7.
It is a self number, because there is not a number n which added to its sum of digits gives 1919.
It is a congruent number.
It is an upside-down number.
21919 is an apocalyptic number.
1919 is a gapful number since it is divisible by the number (19) formed by its first and last digit.
1919 is a wasteful number, since it uses less digits than its factorization.
1919 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 120.
The square root of 1919 is about 43.8063922276. The cubic root of 1919 is about 12.4267718487.
The spelling of 1919 in words is "one thousand, nine hundred nineteen".