1291312793 has 4 divisors (see below), whose sum is σ = 1294254720. Its totient is φ = 1288370868.

The previous prime is 1291312777. The next prime is 1291312831. The reversal of 1291312793 is 3972131921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1291312793 - 2⁴ = 1291312777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1291312703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1470305 + ... + 1471182.

It is an arithmetic number, because the mean of its divisors is an integer number (323563680).

Almost surely, 2^1291312793 is an apocalyptic number.

It is an amenable number.

1291312793 is a deficient number, since it is larger than the sum of its proper divisors (2941927).

1291312793 is an equidigital number, since it uses as much as digits as its factorization.

1291312793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2941926.

The product of its digits is 20412, while the sum is 38.

The square root of 1291312793 is about 35934.8409346695. The cubic root of 1291312793 is about 1088.9563820818.

The spelling of 1291312793 in words is "one billion, two hundred ninety-one million, three hundred twelve thousand, seven hundred ninety-three".