9381278449 has 3 divisors (see below), whose sum is σ = 9381375307. Its totient is φ = 9381181592.

The previous prime is 9381278441. The next prime is 9381278477. The reversal of 9381278449 is 9448721839.

The square root of 9381278449 is 96857.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 849431025 + 8531847424 = 29145^2 + 92368^2 .

It is not a de Polignac number, because 9381278449 - 2³ = 9381278441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9381278449.

It is not an unprimeable number, because it can be changed into a prime (9381278441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 48429 + ... + 145285.

Almost surely, 2^9381278449 is an apocalyptic number.

9381278449 is the 96857-th square number.

9381278449 is the 48429-th centered octagonal number.

It is an amenable number.

9381278449 is a deficient number, since it is larger than the sum of its proper divisors (96858).

9381278449 is an frugal number, since it uses more digits than its factorization.

9381278449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193714 (or 96857 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 55.

The cubic root of 9381278449 is about 2109.0522647913.

The spelling of 9381278449 in words is "nine billion, three hundred eighty-one million, two hundred seventy-eight thousand, four hundred forty-nine".