998800111 has 4 divisors (see below), whose sum is σ = 998865400. Its totient is φ = 998734824.

The previous prime is 998800079. The next prime is 998800147. The reversal of 998800111 is 111008899.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 111008899 = 89 ⋅1247291.

It is a cyclic number.

It is not a de Polignac number, because 998800111 - 2⁵ = 998800079 is a prime.

It is a super-2 number, since 2×998800111² = 1995203323467224642, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998800181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4060 + ... + 44878.

It is an arithmetic number, because the mean of its divisors is an integer number (249716350).

Almost surely, 2^998800111 is an apocalyptic number.

998800111 is a deficient number, since it is larger than the sum of its proper divisors (65289).

998800111 is a wasteful number, since it uses less digits than its factorization.

998800111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65288.

The product of its (nonzero) digits is 5184, while the sum is 37.

The square root of 998800111 is about 31603.7989963232. The cubic root of 998800111 is about 999.5998769229.

The spelling of 998800111 in words is "nine hundred ninety-eight million, eight hundred thousand, one hundred eleven".