1291322528 has 24 divisors (see below), whose sum is σ = 2590262388. Its totient is φ = 633478144.

The previous prime is 1291322521. The next prime is 1291322561. The reversal of 1291322528 is 8252231921.

It can be written as a sum of positive squares in 2 ways, for example, as 1239884944 + 51437584 = 35212^2 + 7172^2 .

It is not an unprimeable number, because it can be changed into a prime (1291322521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 379001 + ... + 382392.

Almost surely, 2^1291322528 is an apocalyptic number.

It is an amenable number.

1291322528 is an abundant number, since it is smaller than the sum of its proper divisors (1298939860).

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

1291322528 is an equidigital number, since it uses as much as digits as its factorization.

1291322528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761456 (or 761448 counting only the distinct ones).

The product of its digits is 17280, while the sum is 35.

The square root of 1291322528 is about 35934.9763879149. The cubic root of 1291322528 is about 1088.9591185641.

The spelling of 1291322528 in words is "one billion, two hundred ninety-one million, three hundred twenty-two thousand, five hundred twenty-eight".