Adding to 22781 its sum of digits (20), we get a square (22801 = 1512).
Adding to 22781 its product of digits (224), we get a triangular number (23005 = T214).
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is a plaindrome in base 12.
It is a nialpdrome in base 14.
It is a congruent number.
222781 is an apocalyptic number.
22781 is the 68-th centered decagonal number.
It is an amenable number.
22781 is a wasteful number, since it uses less digits than its factorization.
22781 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 139.
The square root of 22781 is about 150.9337603056. The cubic root of 22781 is about 28.3481199250.
The spelling of 22781 in words is "twenty-two thousand, seven hundred eighty-one".