998518361 has 4 divisors (see below), whose sum is σ = 998613924. Its totient is φ = 998422800.

The previous prime is 998518349. The next prime is 998518373. The reversal of 998518361 is 163815899.

It is a happy number.

998518361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 163815899 = 13 ⋅12601223.

It is an interprime number because it is at equal distance from previous prime (998518349) and next prime (998518373).

It can be written as a sum of positive squares in 2 ways, for example, as 724417225 + 274101136 = 26915^2 + 16556^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998518361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998518321) 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, 29870 + ... + 53751.

It is an arithmetic number, because the mean of its divisors is an integer number (249653481).

Almost surely, 2^998518361 is an apocalyptic number.

It is an amenable number.

998518361 is a deficient number, since it is larger than the sum of its proper divisors (95563).

998518361 is a wasteful number, since it uses less digits than its factorization.

998518361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95562.

The product of its digits is 466560, while the sum is 50.

The square root of 998518361 is about 31599.3411481948. The cubic root of 998518361 is about 999.5058762152.

The spelling of 998518361 in words is "nine hundred ninety-eight million, five hundred eighteen thousand, three hundred sixty-one".