381911 has 2 divisors, whose sum is σ = 381912. Its totient is φ = 381910.

The previous prime is 381859. The next prime is 381917. The reversal of 381911 is 119183.

It is a strong prime.

It is an emirp because it is prime and its reverse (119183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 381911 - 2¹⁴ = 365527 is a prime.

It is a Sophie Germain 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 (381917) 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, 190955 + 190956.

It is an arithmetic number, because the mean of its divisors is an integer number (190956).

2³⁸¹⁹¹¹ is an apocalyptic number.

381911 is a deficient number, since it is larger than the sum of its proper divisors (1).

381911 is an equidigital number, since it uses as much as digits as its factorization.

381911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 23.

The square root of 381911 is about 617.9894821111. The cubic root of 381911 is about 72.5527796411.

The spelling of 381911 in words is "three hundred eighty-one thousand, nine hundred eleven".