12917318447 has 4 divisors (see below), whose sum is σ = 14091620136. Its totient is φ = 11743016760.

The previous prime is 12917318441. The next prime is 12917318497. The reversal of 12917318447 is 74481371921.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 12917318447 - 2⁴ = 12917318431 is a prime.

It is a super-2 number, since 2×12917318447² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12917318441) 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, 587150828 + ... + 587150849.

It is an arithmetic number, because the mean of its divisors is an integer number (3522905034).

Almost surely, 2^12917318447 is an apocalyptic number.

12917318447 is a deficient number, since it is larger than the sum of its proper divisors (1174301689).

12917318447 is a wasteful number, since it uses less digits than its factorization.

12917318447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174301688.

The product of its digits is 338688, while the sum is 47.

The spelling of 12917318447 in words is "twelve billion, nine hundred seventeen million, three hundred eighteen thousand, four hundred forty-seven".