9912177217 has 2 divisors, whose sum is σ = 9912177218. Its totient is φ = 9912177216.

The previous prime is 9912177169. The next prime is 9912177277. The reversal of 9912177217 is 7127712199.

It is a happy number.

9912177217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9308197441 + 603979776 = 96479^2 + 24576^2 .

It is a cyclic number.

It is not a de Polignac number, because 9912177217 - 2¹⁹ = 9911652929 is a prime.

It is not a weakly prime, because it can be changed into another prime (9912177277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4956088608 + 4956088609.

It is an arithmetic number, because the mean of its divisors is an integer number (4956088609).

Almost surely, 2^9912177217 is an apocalyptic number.

It is an amenable number.

9912177217 is a deficient number, since it is larger than the sum of its proper divisors (1).

9912177217 is an equidigital number, since it uses as much as digits as its factorization.

9912177217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 111132, while the sum is 46.

The square root of 9912177217 is about 99559.9177229471. The cubic root of 9912177217 is about 2148.1091879511.

The spelling of 9912177217 in words is "nine billion, nine hundred twelve million, one hundred seventy-seven thousand, two hundred seventeen".