1291448128 has 28 divisors (see below), whose sum is σ = 2593604160. Its totient is φ = 637941632.

The previous prime is 1291448101. The next prime is 1291448131. The reversal of 1291448128 is 8218441921.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 116248 + ... + 126871.

It is an arithmetic number, because the mean of its divisors is an integer number (92628720).

Almost surely, 2^1291448128 is an apocalyptic number.

It is an amenable number.

1291448128 is an abundant number, since it is smaller than the sum of its proper divisors (1302156032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1291448128 is an equidigital number, since it uses as much as digits as its factorization.

1291448128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243214 (or 243204 counting only the distinct ones).

The product of its digits is 36864, while the sum is 40.

The square root of 1291448128 is about 35936.7239464034. The cubic root of 1291448128 is about 1088.9944231525.

The spelling of 1291448128 in words is "one billion, two hundred ninety-one million, four hundred forty-eight thousand, one hundred twenty-eight".