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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 145371899 = 139 ⋅1045841.
It is a cyclic number.
It is a Duffinian number.
It is a congruent number.
Almost surely, 2998173541 is an apocalyptic number.
It is an amenable number.
998173541 is a wasteful number, since it uses less digits than its factorization.
998173541 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 63258.
The square root of 998173541 is about 31593.8845506532. The cubic root of 998173541 is about 999.3908092954.
The spelling of 998173541 in words is "nine hundred ninety-eight million, one hundred seventy-three thousand, five hundred forty-one".