8999999993 has 2 divisors, whose sum is σ = 8999999994. Its totient is φ = 8999999992.

The previous prime is 8999999929. The next prime is 9000000001. The reversal of 8999999993 is 3999999998.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5200140544 + 3799859449 = 72112^2 + 61643^2 .

It is a cyclic number.

It is not a de Polignac number, because 8999999993 - 2⁶ = 8999999929 is a prime.

It is not a weakly prime, because it can be changed into another prime (8999992993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4499999996 + 4499999997.

It is an arithmetic number, because the mean of its divisors is an integer number (4499999997).

Almost surely, 2^8999999993 is an apocalyptic number.

It is an amenable number.

8999999993 is a deficient number, since it is larger than the sum of its proper divisors (1).

8999999993 is an equidigital number, since it uses as much as digits as its factorization.

8999999993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1033121304, while the sum is 83.

The square root of 8999999993 is about 94868.3297681581. The cubic root of 8999999993 is about 2080.0838225126.

It can be divided in two parts, 8 and 999999993, that added together give a palindrome (1000000001).

The spelling of 8999999993 in words is "eight billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-three".