It is a happy number.
998724481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 184427899 = 3037 ⋅60727.
It is a cyclic number.
It is a Duffinian number.
It is a Poulet number, since it divides 2998724480-1.
Almost surely, 2998724481 is an apocalyptic number.
It is an amenable number.
998724481 is a wasteful number, since it uses less digits than its factorization.
998724481 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 7623982.
The square root of 998724481 is about 31602.6024403055. The cubic root of 998724481 is about 999.5746460997.
The spelling of 998724481 in words is "nine hundred ninety-eight million, seven hundred twenty-four thousand, four hundred eighty-one".