381611 has 4 divisors (see below), whose sum is σ = 394800. Its totient is φ = 368424.

The previous prime is 381607. The next prime is 381629. The reversal of 381611 is 116183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 116183 = 223 ⋅521.

It is a cyclic number.

It is not a de Polignac number, because 381611 - 2² = 381607 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381631) 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, 6551 + ... + 6608.

It is an arithmetic number, because the mean of its divisors is an integer number (98700).

2³⁸¹⁶¹¹ is an apocalyptic number.

381611 is a deficient number, since it is larger than the sum of its proper divisors (13189).

381611 is a wasteful number, since it uses less digits than its factorization.

381611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13188.

The product of its digits is 144, while the sum is 20.

The square root of 381611 is about 617.7467118488. The cubic root of 381611 is about 72.5337773643.

Adding to 381611 its reverse (116183), we get a palindrome (497794).

The spelling of 381611 in words is "three hundred eighty-one thousand, six hundred eleven".