8378281 has 2 divisors, whose sum is σ = 8378282. Its totient is φ = 8378280.

The previous prime is 8378273. The next prime is 8378287. The reversal of 8378281 is 1828738.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8037225 + 341056 = 2835^2 + 584^2 .

It is a cyclic number.

It is not a de Polignac number, because 8378281 - 2³ = 8378273 is a prime.

It is a super-2 number, since 2×8378281² = 140391185029922, which contains 22 as substring.

8378281 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 8378281.

It is not a weakly prime, because it can be changed into another prime (8378287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4189140 + 4189141.

It is an arithmetic number, because the mean of its divisors is an integer number (4189141).

Almost surely, 2^8378281 is an apocalyptic number.

It is an amenable number.

8378281 is a deficient number, since it is larger than the sum of its proper divisors (1).

8378281 is an equidigital number, since it uses as much as digits as its factorization.

8378281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21504, while the sum is 37.

The square root of 8378281 is about 2894.5260406498. The cubic root of 8378281 is about 203.1039208422.

The spelling of 8378281 in words is "eight million, three hundred seventy-eight thousand, two hundred eighty-one".