1291243232 has 12 divisors (see below), whose sum is σ = 2542135176. Its totient is φ = 645621600.

The previous prime is 1291243193. The next prime is 1291243237. The reversal of 1291243232 is 2323421921.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1291243195 and 1291243204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291243237) 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, 20175644 + ... + 20175707.

It is an arithmetic number, because the mean of its divisors is an integer number (211844598).

Almost surely, 2^1291243232 is an apocalyptic number.

It is an amenable number.

1291243232 is a deficient number, since it is larger than the sum of its proper divisors (1250891944).

1291243232 is an equidigital number, since it uses as much as digits as its factorization.

1291243232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40351361 (or 40351353 counting only the distinct ones).

The product of its digits is 5184, while the sum is 29.

The square root of 1291243232 is about 35933.8730448027. The cubic root of 1291243232 is about 1088.9368282718.

The spelling of 1291243232 in words is "one billion, two hundred ninety-one million, two hundred forty-three thousand, two hundred thirty-two".