8381264449 has 4 divisors (see below), whose sum is σ = 8394848964. Its totient is φ = 8367679936.

The previous prime is 8381264447. The next prime is 8381264467. The reversal of 8381264449 is 9444621838.

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 410346049 + 7970918400 = 20257^2 + 89280^2 .

It is a cyclic number.

It is not a de Polignac number, because 8381264449 - 2¹ = 8381264447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8381264443) 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 3 ways as a sum of consecutive naturals, for example, 6791332 + ... + 6792565.

It is an arithmetic number, because the mean of its divisors is an integer number (2098712241).

Almost surely, 2^8381264449 is an apocalyptic number.

It is an amenable number.

8381264449 is a deficient number, since it is larger than the sum of its proper divisors (13584515).

8381264449 is a wasteful number, since it uses less digits than its factorization.

8381264449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13584514.

The product of its digits is 1327104, while the sum is 49.

The square root of 8381264449 is about 91549.2460318489. The cubic root of 8381264449 is about 2031.2802595710.

The spelling of 8381264449 in words is "eight billion, three hundred eighty-one million, two hundred sixty-four thousand, four hundred forty-nine".