9991395473 has 2 divisors, whose sum is σ = 9991395474. Its totient is φ = 9991395472.

The previous prime is 9991395467. The next prime is 9991395481. The reversal of 9991395473 is 3745931999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5937781249 + 4053614224 = 77057^2 + 63668^2 .

It is a cyclic number.

It is not a de Polignac number, because 9991395473 - 2¹⁰ = 9991394449 is a prime.

It is not a weakly prime, because it can be changed into another prime (9991395413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995697736 + 4995697737.

It is an arithmetic number, because the mean of its divisors is an integer number (4995697737).

Almost surely, 2^9991395473 is an apocalyptic number.

It is an amenable number.

9991395473 is a deficient number, since it is larger than the sum of its proper divisors (1).

9991395473 is an equidigital number, since it uses as much as digits as its factorization.

9991395473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8266860, while the sum is 59.

The square root of 9991395473 is about 99956.9681062806. The cubic root of 9991395473 is about 2153.8165829987.

The spelling of 9991395473 in words is "nine billion, nine hundred ninety-one million, three hundred ninety-five thousand, four hundred seventy-three".