9717842549 has 4 divisors (see below), whose sum is σ = 10289480364. Its totient is φ = 9146204736.

The previous prime is 9717842513. The next prime is 9717842557. The reversal of 9717842549 is 9452487179.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6340140625 + 3377701924 = 79625^2 + 58118^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9717842549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9717842494 and 9717842503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9717842579) 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, 285818882 + ... + 285818915.

It is an arithmetic number, because the mean of its divisors is an integer number (2572370091).

Almost surely, 2^9717842549 is an apocalyptic number.

It is an amenable number.

9717842549 is a deficient number, since it is larger than the sum of its proper divisors (571637815).

9717842549 is a wasteful number, since it uses less digits than its factorization.

9717842549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571637814.

The product of its digits is 5080320, while the sum is 56.

The square root of 9717842549 is about 98579.1182198340. The cubic root of 9717842549 is about 2133.9780734173.

The spelling of 9717842549 in words is "nine billion, seven hundred seventeen million, eight hundred forty-two thousand, five hundred forty-nine".