381791 has 2 divisors, whose sum is σ = 381792. Its totient is φ = 381790.

The previous prime is 381761. The next prime is 381793. The reversal of 381791 is 197183.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381791 is a prime.

It is a Sophie Germain prime.

Together with 381793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381793) 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, 190895 + 190896.

It is an arithmetic number, because the mean of its divisors is an integer number (190896).

2³⁸¹⁷⁹¹ is an apocalyptic number.

381791 is a deficient number, since it is larger than the sum of its proper divisors (1).

381791 is an equidigital number, since it uses as much as digits as its factorization.

381791 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 381791 is about 617.8923854524. The cubic root of 381791 is about 72.5451799249.

The spelling of 381791 in words is "three hundred eighty-one thousand, seven hundred ninety-one".