19105 has 4 divisors (see below), whose sum is σ = 22932. Its totient is φ = 15280.

The previous prime is 19087. The next prime is 19121. The reversal of 19105 is 50191.

19105 is nontrivially palindromic in base 4.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50191 = 53 ⋅947.

It can be written as a sum of positive squares in 2 ways, for example, as 12544 + 6561 = 112^2 + 81^2 .

It is not a de Polignac number, because 19105 - 2⁵ = 19073 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1906 + ... + 1915.

It is an arithmetic number, because the mean of its divisors is an integer number (5733).

2¹⁹¹⁰⁵ is an apocalyptic number.

It is an amenable number.

19105 is a deficient number, since it is larger than the sum of its proper divisors (3827).

19105 is an equidigital number, since it uses as much as digits as its factorization.

19105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3826.

The product of its (nonzero) digits is 45, while the sum is 16.

The square root of 19105 is about 138.2208377923. The cubic root of 19105 is about 26.7330809832.

Adding to 19105 its reverse (50191), we get a palindrome (69296).

The spelling of 19105 in words is "nineteen thousand, one hundred five".