381505117871 has 2 divisors, whose sum is σ = 381505117872. Its totient is φ = 381505117870.

The previous prime is 381505117867. The next prime is 381505117883. The reversal of 381505117871 is 178711505183.

It is a weak prime.

It is an emirp because it is prime and its reverse (178711505183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 381505117871 - 2² = 381505117867 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381505117571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190752558935 + 190752558936.

It is an arithmetic number, because the mean of its divisors is an integer number (190752558936).

Almost surely, 2^381505117871 is an apocalyptic number.

381505117871 is a deficient number, since it is larger than the sum of its proper divisors (1).

381505117871 is an equidigital number, since it uses as much as digits as its factorization.

381505117871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 235200, while the sum is 47.

The spelling of 381505117871 in words is "three hundred eighty-one billion, five hundred five million, one hundred seventeen thousand, eight hundred seventy-one".