1291539488 has 18 divisors (see below), whose sum is σ = 2543118669. Its totient is φ = 645668096.

The previous prime is 1291539481. The next prime is 1291539527. The reversal of 1291539488 is 8849351921.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 1289384464 + 2155024 = 35908^2 + 1468^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=25412.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1291539481) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 200120 + ... + 206472.

Almost surely, 2^1291539488 is an apocalyptic number.

It is an amenable number.

1291539488 is a deficient number, since it is larger than the sum of its proper divisors (1251579181).

1291539488 is an frugal number, since it uses more digits than its factorization.

1291539488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12716 (or 6355 counting only the distinct ones).

The product of its digits is 622080, while the sum is 50.

The square root of 1291539488 is about 35937.9950470251. The cubic root of 1291539488 is about 1089.0201018673.

Multiplying 1291539488 by its sum of digits (50), we get a square (64576974400 = 254120²).

The spelling of 1291539488 in words is "one billion, two hundred ninety-one million, five hundred thirty-nine thousand, four hundred eighty-eight".