243147 has 4 divisors (see below), whose sum is σ = 324200. Its totient is φ = 162096.

The previous prime is 243137. The next prime is 243149. The reversal of 243147 is 741342.

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

It is a de Polignac number, because none of the positive numbers 2^k-243147 is a prime.

It is a D-number.

It is a Duffinian number.

243147 is a lucky number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (243149) 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, 40522 + ... + 40527.

It is an arithmetic number, because the mean of its divisors is an integer number (81050).

2²⁴³¹⁴⁷ is an apocalyptic number.

243147 is a deficient number, since it is larger than the sum of its proper divisors (81053).

243147 is an equidigital number, since it uses as much as digits as its factorization.

243147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81052.

The product of its digits is 672, while the sum is 21.

The square root of 243147 is about 493.0993814638. The cubic root of 243147 is about 62.4150953782.

Adding to 243147 its reverse (741342), we get a palindrome (984489).

It can be divided in two parts, 243 and 147, that multiplied together give a square (35721 = 189²).

The spelling of 243147 in words is "two hundred forty-three thousand, one hundred forty-seven", and thus it is an iban number.