105445 has 4 divisors (see below), whose sum is σ = 126540. Its totient is φ = 84352.

The previous prime is 105437. The next prime is 105449. The reversal of 105445 is 544501.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 79524 + 25921 = 282^2 + 161^2 .

It is a cyclic number.

It is not a de Polignac number, because 105445 - 2³ = 105437 is a prime.

It is a super-2 number, since 2×105445² = 22237296050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105449) 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, 10540 + ... + 10549.

It is an arithmetic number, because the mean of its divisors is an integer number (31635).

2¹⁰⁵⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

105445 is a deficient number, since it is larger than the sum of its proper divisors (21095).

105445 is an equidigital number, since it uses as much as digits as its factorization.

105445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21094.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 105445 is about 324.7229588434. The cubic root of 105445 is about 47.2434926604.

Adding to 105445 its reverse (544501), we get a palindrome (649946).

The spelling of 105445 in words is "one hundred five thousand, four hundred forty-five".