1291316783 has 8 divisors (see below), whose sum is σ = 1309636608. Its totient is φ = 1273014144.

The previous prime is 1291316777. The next prime is 1291316791. The reversal of 1291316783 is 3876131921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1291316783 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1291316783.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291316183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259091 + ... + 264027.

It is an arithmetic number, because the mean of its divisors is an integer number (163704576).

Almost surely, 2^1291316783 is an apocalyptic number.

1291316783 is a deficient number, since it is larger than the sum of its proper divisors (18319825).

1291316783 is an equidigital number, since it uses as much as digits as its factorization.

1291316783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8593.

The product of its digits is 54432, while the sum is 41.

The square root of 1291316783 is about 35934.8964517779. The cubic root of 1291316783 is about 1088.9575036617.

The spelling of 1291316783 in words is "one billion, two hundred ninety-one million, three hundred sixteen thousand, seven hundred eighty-three".