1317296891 has 4 divisors (see below), whose sum is σ = 1338891984. Its totient is φ = 1295701800.

The previous prime is 1317296879. The next prime is 1317296947. The reversal of 1317296891 is 1986927131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1317296891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1317296801) 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 in 3 ways as a sum of consecutive naturals, for example, 10797455 + ... + 10797576.

It is an arithmetic number, because the mean of its divisors is an integer number (334722996).

Almost surely, 2^1317296891 is an apocalyptic number.

1317296891 is a deficient number, since it is larger than the sum of its proper divisors (21595093).

1317296891 is an equidigital number, since it uses as much as digits as its factorization.

1317296891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21595092.

The product of its digits is 163296, while the sum is 47.

The square root of 1317296891 is about 36294.5848715755. The cubic root of 1317296891 is about 1096.2120093865.

The spelling of 1317296891 in words is "one billion, three hundred seventeen million, two hundred ninety-six thousand, eight hundred ninety-one".