998648841 has 4 divisors (see below), whose sum is σ = 1331531792. Its totient is φ = 665765892.

The previous prime is 998648839. The next prime is 998648851. The reversal of 998648841 is 148846899.

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.

It is not a de Polignac number, because 998648841 - 2¹ = 998648839 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998648831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166441471 + ... + 166441476.

It is an arithmetic number, because the mean of its divisors is an integer number (332882948).

Almost surely, 2^998648841 is an apocalyptic number.

It is an amenable number.

998648841 is a deficient number, since it is larger than the sum of its proper divisors (332882951).

998648841 is a wasteful number, since it uses less digits than its factorization.

998648841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332882950.

The product of its digits is 3981312, while the sum is 57.

The square root of 998648841 is about 31601.4056807605. The cubic root of 998648841 is about 999.5494106664.

The spelling of 998648841 in words is "nine hundred ninety-eight million, six hundred forty-eight thousand, eight hundred forty-one".