381217871 has 2 divisors, whose sum is σ = 381217872. Its totient is φ = 381217870.

The previous prime is 381217867. The next prime is 381217909. The reversal of 381217871 is 178712183.

It is an a-pointer prime, because the next prime (381217909) can be obtained adding 381217871 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 381217871 - 2² = 381217867 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381217861) 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, 190608935 + 190608936.

It is an arithmetic number, because the mean of its divisors is an integer number (190608936).

Almost surely, 2^381217871 is an apocalyptic number.

381217871 is a deficient number, since it is larger than the sum of its proper divisors (1).

381217871 is an equidigital number, since it uses as much as digits as its factorization.

381217871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18816, while the sum is 38.

The square root of 381217871 is about 19524.8014330492. The cubic root of 381217871 is about 725.0886112858.

The spelling of 381217871 in words is "three hundred eighty-one million, two hundred seventeen thousand, eight hundred seventy-one".