9912788449 has 2 divisors, whose sum is σ = 9912788450. Its totient is φ = 9912788448.

The previous prime is 9912788441. The next prime is 9912788461. The reversal of 9912788449 is 9448872199.

9912788449 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., 8378656225 + 1534132224 = 91535^2 + 39168^2 .

It is a cyclic number.

It is not a de Polignac number, because 9912788449 - 2³ = 9912788441 is a prime.

It is not a weakly prime, because it can be changed into another prime (9912788441) 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, 4956394224 + 4956394225.

It is an arithmetic number, because the mean of its divisors is an integer number (4956394225).

Almost surely, 2^9912788449 is an apocalyptic number.

It is an amenable number.

9912788449 is a deficient number, since it is larger than the sum of its proper divisors (1).

9912788449 is an equidigital number, since it uses as much as digits as its factorization.

9912788449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10450944, while the sum is 61.

The square root of 9912788449 is about 99562.9873446955. The cubic root of 9912788449 is about 2148.1533412540.

The spelling of 9912788449 in words is "nine billion, nine hundred twelve million, seven hundred eighty-eight thousand, four hundred forty-nine".