8198999993 has 2 divisors, whose sum is σ = 8198999994. Its totient is φ = 8198999992.

The previous prime is 8198999903. The next prime is 8199000041. The reversal of 8198999993 is 3999998918.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7781533369 + 417466624 = 88213^2 + 20432^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8198999993 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 8198999993.

It is not a weakly prime, because it can be changed into another prime (8198999903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4099499996 + 4099499997.

It is an arithmetic number, because the mean of its divisors is an integer number (4099499997).

Almost surely, 2^8198999993 is an apocalyptic number.

It is an amenable number.

8198999993 is a deficient number, since it is larger than the sum of its proper divisors (1).

8198999993 is an equidigital number, since it uses as much as digits as its factorization.

8198999993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102036672, while the sum is 74.

The square root of 8198999993 is about 90548.3295980660. The cubic root of 8198999993 is about 2016.4476985608.

The spelling of 8198999993 in words is "eight billion, one hundred ninety-eight million, nine hundred ninety-nine thousand, nine hundred ninety-three".