9491288989993 has 2 divisors, whose sum is σ = 9491288989994. Its totient is φ = 9491288989992.

The previous prime is 9491288989979. The next prime is 9491288989997. The reversal of 9491288989993 is 3999898821949.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8221908207769 + 1269380782224 = 2867387^2 + 1126668^2 .

It is a cyclic number.

It is not a de Polignac number, because 9491288989993 - 2¹⁷ = 9491288858921 is a prime.

It is not a weakly prime, because it can be changed into another prime (9491288989997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4745644494996 + 4745644494997.

It is an arithmetic number, because the mean of its divisors is an integer number (4745644494997).

Almost surely, 2^{9491288989993} is an apocalyptic number.

It is an amenable number.

9491288989993 is a deficient number, since it is larger than the sum of its proper divisors (1).

9491288989993 is an equidigital number, since it uses as much as digits as its factorization.

9491288989993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6530347008, while the sum is 88.

The spelling of 9491288989993 in words is "nine trillion, four hundred ninety-one billion, two hundred eighty-eight million, nine hundred eighty-nine thousand, nine hundred ninety-three".