998147521 has 8 divisors (see below), whose sum is σ = 1140951680. Its totient is φ = 855396288.

The previous prime is 998147461. The next prime is 998147543. The reversal of 998147521 is 125741899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998147521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998147551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43300 + ... + 62218.

It is an arithmetic number, because the mean of its divisors is an integer number (142618960).

Almost surely, 2^998147521 is an apocalyptic number.

998147521 is the 18241-st hex number.

It is an amenable number.

998147521 is a deficient number, since it is larger than the sum of its proper divisors (142804159).

998147521 is a wasteful number, since it uses less digits than its factorization.

998147521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26463.

The product of its digits is 181440, while the sum is 46.

The square root of 998147521 is about 31593.4727594166. The cubic root of 998147521 is about 999.3821253095.

The spelling of 998147521 in words is "nine hundred ninety-eight million, one hundred forty-seven thousand, five hundred twenty-one".