243420545 has 8 divisors (see below), whose sum is σ = 292212096. Its totient is φ = 194664816.

The previous prime is 243420511. The next prime is 243420547. The reversal of 243420545 is 545024342.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243420545 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243420547) 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 7 ways as a sum of consecutive naturals, for example, 9434 + ... + 23996.

It is an arithmetic number, because the mean of its divisors is an integer number (36526512).

Almost surely, 2^243420545 is an apocalyptic number.

It is an amenable number.

243420545 is a deficient number, since it is larger than the sum of its proper divisors (48791551).

243420545 is a wasteful number, since it uses less digits than its factorization.

243420545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17911.

The product of its (nonzero) digits is 19200, while the sum is 29.

The square root of 243420545 is about 15601.9404241908. The cubic root of 243420545 is about 624.3849266275.

Adding to 243420545 its reverse (545024342), we get a palindrome (788444887).

The spelling of 243420545 in words is "two hundred forty-three million, four hundred twenty thousand, five hundred forty-five".