998111867 has 8 divisors (see below), whose sum is σ = 1031590272. Its totient is φ = 964713600.

The previous prime is 998111839. The next prime is 998111897. The reversal of 998111867 is 768111899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998111867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998111897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5843 + ... + 45059.

It is an arithmetic number, because the mean of its divisors is an integer number (128948784).

Almost surely, 2^998111867 is an apocalyptic number.

998111867 is a deficient number, since it is larger than the sum of its proper divisors (33478405).

998111867 is a wasteful number, since it uses less digits than its factorization.

998111867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40069.

The product of its digits is 217728, while the sum is 50.

The square root of 998111867 is about 31592.9084922550. The cubic root of 998111867 is about 999.3702258011.

The spelling of 998111867 in words is "nine hundred ninety-eight million, one hundred eleven thousand, eight hundred sixty-seven".