105243 has 4 divisors (see below), whose sum is σ = 140328. Its totient is φ = 70160.

The previous prime is 105239. The next prime is 105251. The reversal of 105243 is 342501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342501 = 3 ⋅114167.

It is a cyclic number.

It is not a de Polignac number, because 105243 - 2² = 105239 is a prime.

It is a super-2 number, since 2×105243² = 22152178098, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (105253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17538 + ... + 17543.

It is an arithmetic number, because the mean of its divisors is an integer number (35082).

2¹⁰⁵²⁴³ is an apocalyptic number.

105243 is a deficient number, since it is larger than the sum of its proper divisors (35085).

105243 is an equidigital number, since it uses as much as digits as its factorization.

105243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35084.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 105243 is about 324.4117753720. The cubic root of 105243 is about 47.2133054034.

Adding to 105243 its reverse (342501), we get a palindrome (447744).

It can be divided in two parts, 10 and 5243, that added together give a triangular number (5253 = T₁₀₂).

The spelling of 105243 in words is "one hundred five thousand, two hundred forty-three".