1128997447 has 4 divisors (see below), whose sum is σ = 1129356880. Its totient is φ = 1128638016.

The previous prime is 1128997417. The next prime is 1128997459. The reversal of 1128997447 is 7447998211.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7447998211 = 971 ⋅7670441.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1128997447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1128997394 and 1128997403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128997417) 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 in 3 ways as a sum of consecutive naturals, for example, 174963 + ... + 181300.

It is an arithmetic number, because the mean of its divisors is an integer number (282339220).

Almost surely, 2^1128997447 is an apocalyptic number.

1128997447 is a deficient number, since it is larger than the sum of its proper divisors (359433).

1128997447 is an equidigital number, since it uses as much as digits as its factorization.

1128997447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359432.

The product of its digits is 1016064, while the sum is 52.

The square root of 1128997447 is about 33600.5572424030. The cubic root of 1128997447 is about 1041.2723108859.

The spelling of 1128997447 in words is "one billion, one hundred twenty-eight million, nine hundred ninety-seven thousand, four hundred forty-seven".