998111109 has 4 divisors (see below), whose sum is σ = 1330814816. Its totient is φ = 665407404.

The previous prime is 998111077. The next prime is 998111111. The reversal of 998111109 is 901111899.

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 998111109 - 2⁵ = 998111077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998111119) 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, 166351849 + ... + 166351854.

It is an arithmetic number, because the mean of its divisors is an integer number (332703704).

Almost surely, 2^998111109 is an apocalyptic number.

It is an amenable number.

998111109 is a deficient number, since it is larger than the sum of its proper divisors (332703707).

998111109 is a wasteful number, since it uses less digits than its factorization.

998111109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332703706.

The product of its (nonzero) digits is 5832, while the sum is 39.

The square root of 998111109 is about 31592.8964958897. The cubic root of 998111109 is about 999.3699728158.

The spelling of 998111109 in words is "nine hundred ninety-eight million, one hundred eleven thousand, one hundred nine".