384809281 has 2 divisors, whose sum is σ = 384809282. Its totient is φ = 384809280.

The previous prime is 384809273. The next prime is 384809291. The reversal of 384809281 is 182908483.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 261954225 + 122855056 = 16185^2 + 11084^2 .

It is a cyclic number.

It is not a de Polignac number, because 384809281 - 2³ = 384809273 is a prime.

It is a super-2 number, since 2×384809281² = 296156365487473922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (384809291) 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, 192404640 + 192404641.

It is an arithmetic number, because the mean of its divisors is an integer number (192404641).

Almost surely, 2^384809281 is an apocalyptic number.

It is an amenable number.

384809281 is a deficient number, since it is larger than the sum of its proper divisors (1).

384809281 is an equidigital number, since it uses as much as digits as its factorization.

384809281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 384809281 is about 19616.5562981885. The cubic root of 384809281 is about 727.3584903647.

The spelling of 384809281 in words is "three hundred eighty-four million, eight hundred nine thousand, two hundred eighty-one".