998646899 has 4 divisors (see below), whose sum is σ = 998712000. Its totient is φ = 998581800.

The previous prime is 998646889. The next prime is 998646917.

998646899 is nontrivially palindromic in base 10.

998646899 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 brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 998646899 - 2²⁴ = 981869683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998646809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4574 + ... + 44924.

It is an arithmetic number, because the mean of its divisors is an integer number (249678000).

Almost surely, 2^998646899 is an apocalyptic number.

998646899 is a deficient number, since it is larger than the sum of its proper divisors (65101).

998646899 is a wasteful number, since it uses less digits than its factorization.

998646899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65100.

The product of its digits is 60466176, while the sum is 68.

The square root of 998646899 is about 31601.3749542643. The cubic root of 998646899 is about 999.5487627489.

The spelling of 998646899 in words is "nine hundred ninety-eight million, six hundred forty-six thousand, eight hundred ninety-nine".