384921281 has 2 divisors, whose sum is σ = 384921282. Its totient is φ = 384921280.

The previous prime is 384921239. The next prime is 384921283. The reversal of 384921281 is 182129483.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 384748225 + 173056 = 19615^2 + 416^2 .

It is a cyclic number.

It is not a de Polignac number, because 384921281 - 2⁶ = 384921217 is a prime.

It is a super-2 number, since 2×384921281² = 296328785133361922, which contains 22 as substring.

Together with 384921283, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (384921283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192460640 + 192460641.

It is an arithmetic number, because the mean of its divisors is an integer number (192460641).

Almost surely, 2^384921281 is an apocalyptic number.

It is an amenable number.

384921281 is a deficient number, since it is larger than the sum of its proper divisors (1).

384921281 is an equidigital number, since it uses as much as digits as its factorization.

384921281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 38.

The square root of 384921281 is about 19619.4108219386. The cubic root of 384921281 is about 727.4290502089.

The spelling of 384921281 in words is "three hundred eighty-four million, nine hundred twenty-one thousand, two hundred eighty-one".