999998918394841 has 4 divisors (see below), whose sum is σ = 999999036381712. Its totient is φ = 999998800407972.

The previous prime is 999998918394823. The next prime is 999998918395007. The reversal of 999998918394841 is 148493819899999.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 999998918394841 - 2⁷ = 999998918394713 is a prime.

It is the 31622760-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999998918394241) by changing a digit.

It is a nontrivial repunit in base 31622759.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45206091 + ... + 63589216.

It is an arithmetic number, because the mean of its divisors is an integer number (249999759095428).

Almost surely, 2^{999998918394841} is an apocalyptic number.

It is an amenable number.

999998918394841 is a deficient number, since it is larger than the sum of its proper divisors (117986871).

999998918394841 is a wasteful number, since it uses less digits than its factorization.

999998918394841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117986870.

The product of its digits is 117546246144, while the sum is 100.

The spelling of 999998918394841 in words is "nine hundred ninety-nine trillion, nine hundred ninety-eight billion, nine hundred eighteen million, three hundred ninety-four thousand, eight hundred forty-one".