381111 has 4 divisors (see below), whose sum is σ = 508152. Its totient is φ = 254072.

The previous prime is 381103. The next prime is 381167. The reversal of 381111 is 111183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111183 = 3 ⋅37061.

It is a cyclic number.

It is not a de Polignac number, because 381111 - 2³ = 381103 is a prime.

It is a D-number.

381111 is a modest number, since divided by 1111 gives 38 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63516 + ... + 63521.

It is an arithmetic number, because the mean of its divisors is an integer number (127038).

2³⁸¹¹¹¹ is an apocalyptic number.

381111 is a deficient number, since it is larger than the sum of its proper divisors (127041).

381111 is a wasteful number, since it uses less digits than its factorization.

381111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127040.

The product of its digits is 24, while the sum is 15.

The square root of 381111 is about 617.3418825902. The cubic root of 381111 is about 72.5020847597.

Adding to 381111 its reverse (111183), we get a palindrome (492294).

The spelling of 381111 in words is "three hundred eighty-one thousand, one hundred eleven".