243115 has 4 divisors (see below), whose sum is σ = 291744. Its totient is φ = 194488.

The previous prime is 243109. The next prime is 243119. The reversal of 243115 is 511342.

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

It is a cyclic number.

It is not a de Polignac number, because 243115 - 2⁹ = 242603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243119) 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, 24307 + ... + 24316.

It is an arithmetic number, because the mean of its divisors is an integer number (72936).

2²⁴³¹¹⁵ is an apocalyptic number.

243115 is a deficient number, since it is larger than the sum of its proper divisors (48629).

243115 is an equidigital number, since it uses as much as digits as its factorization.

243115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48628.

The product of its digits is 120, while the sum is 16.

The square root of 243115 is about 493.0669325761. The cubic root of 243115 is about 62.4123571572.

Adding to 243115 its reverse (511342), we get a palindrome (754457).

The spelling of 243115 in words is "two hundred forty-three thousand, one hundred fifteen".