998606899 has 4 divisors (see below), whose sum is σ = 998677264. Its totient is φ = 998536536.

The previous prime is 998606891. The next prime is 998606923.

998606899 is nontrivially palindromic in base 10.

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 998606899 - 2³ = 998606891 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 998606899.

It is not an unprimeable number, because it can be changed into a prime (998606891) 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, 5607 + ... + 45040.

It is an arithmetic number, because the mean of its divisors is an integer number (249669316).

Almost surely, 2^998606899 is an apocalyptic number.

998606899 is a deficient number, since it is larger than the sum of its proper divisors (70365).

998606899 is a wasteful number, since it uses less digits than its factorization.

998606899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70364.

The product of its (nonzero) digits is 15116544, while the sum is 64.

The square root of 998606899 is about 31600.7420640718. The cubic root of 998606899 is about 999.5354171962.

The spelling of 998606899 in words is "nine hundred ninety-eight million, six hundred six thousand, eight hundred ninety-nine".