381917 has 2 divisors, whose sum is σ = 381918. Its totient is φ = 381916.

The previous prime is 381911. The next prime is 381937. The reversal of 381917 is 719183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 329476 + 52441 = 574^2 + 229^2 .

It is an emirp because it is prime and its reverse (719183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 381917 - 2⁶ = 381853 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 381917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190958 + 190959.

It is an arithmetic number, because the mean of its divisors is an integer number (190959).

2³⁸¹⁹¹⁷ is an apocalyptic number.

It is an amenable number.

381917 is a deficient number, since it is larger than the sum of its proper divisors (1).

381917 is an equidigital number, since it uses as much as digits as its factorization.

381917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 29.

The square root of 381917 is about 617.9943365436. The cubic root of 381917 is about 72.5531595851.

The spelling of 381917 in words is "three hundred eighty-one thousand, nine hundred seventeen".