381278017 has 2 divisors, whose sum is σ = 381278018. Its totient is φ = 381278016.

The previous prime is 381278011. The next prime is 381278059. The reversal of 381278017 is 710872183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 353778481 + 27499536 = 18809^2 + 5244^2 .

It is a cyclic number.

It is not a de Polignac number, because 381278017 - 2⁷ = 381277889 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (381278011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190639008 + 190639009.

It is an arithmetic number, because the mean of its divisors is an integer number (190639009).

Almost surely, 2^381278017 is an apocalyptic number.

It is an amenable number.

381278017 is a deficient number, since it is larger than the sum of its proper divisors (1).

381278017 is an equidigital number, since it uses as much as digits as its factorization.

381278017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 381278017 is about 19526.3416184394. The cubic root of 381278017 is about 725.1267424872.

The spelling of 381278017 in words is "three hundred eighty-one million, two hundred seventy-eight thousand, seventeen".