8381219449 has 2 divisors, whose sum is σ = 8381219450. Its totient is φ = 8381219448.

The previous prime is 8381219387. The next prime is 8381219461. The reversal of 8381219449 is 9449121838.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8123777424 + 257442025 = 90132^2 + 16045^2 .

It is a cyclic number.

It is not a de Polignac number, because 8381219449 - 2⁷ = 8381219321 is a prime.

It is not a weakly prime, because it can be changed into another prime (8381219479) 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 as a sum of consecutive naturals, namely, 4190609724 + 4190609725.

It is an arithmetic number, because the mean of its divisors is an integer number (4190609725).

Almost surely, 2^8381219449 is an apocalyptic number.

It is an amenable number.

8381219449 is a deficient number, since it is larger than the sum of its proper divisors (1).

8381219449 is an equidigital number, since it uses as much as digits as its factorization.

8381219449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 49.

The square root of 8381219449 is about 91549.0002621547. Note that the first 3 decimals coincide. The cubic root of 8381219449 is about 2031.2766241698.

The spelling of 8381219449 in words is "eight billion, three hundred eighty-one million, two hundred nineteen thousand, four hundred forty-nine".