1317843923 has 4 divisors (see below), whose sum is σ = 1437647928. Its totient is φ = 1198039920.

The previous prime is 1317843913. The next prime is 1317843937. The reversal of 1317843923 is 3293487131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3293487131 = 11 ⋅299407921.

It is not a de Polignac number, because 1317843923 - 2¹² = 1317839827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1317843913) 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, 59901986 + ... + 59902007.

It is an arithmetic number, because the mean of its divisors is an integer number (359411982).

Almost surely, 2^1317843923 is an apocalyptic number.

1317843923 is a deficient number, since it is larger than the sum of its proper divisors (119804005).

1317843923 is a wasteful number, since it uses less digits than its factorization.

1317843923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119804004.

The product of its digits is 108864, while the sum is 41.

The square root of 1317843923 is about 36302.1200896036. The cubic root of 1317843923 is about 1096.3637291858.

The spelling of 1317843923 in words is "one billion, three hundred seventeen million, eight hundred forty-three thousand, nine hundred twenty-three".