243421545 has 8 divisors (see below), whose sum is σ = 389474496. Its totient is φ = 129824816.

The previous prime is 243421543. The next prime is 243421609. The reversal of 243421545 is 545124342.

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

It is a cyclic number.

It is not a de Polignac number, because 243421545 - 2¹ = 243421543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243421543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8114037 + ... + 8114066.

It is an arithmetic number, because the mean of its divisors is an integer number (48684312).

Almost surely, 2^243421545 is an apocalyptic number.

It is an amenable number.

243421545 is a deficient number, since it is larger than the sum of its proper divisors (146052951).

243421545 is a wasteful number, since it uses less digits than its factorization.

243421545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16228111.

The product of its digits is 19200, while the sum is 30.

The square root of 243421545 is about 15601.9724714537. The cubic root of 243421545 is about 624.3857816417.

Adding to 243421545 its reverse (545124342), we get a palindrome (788545887).

The spelling of 243421545 in words is "two hundred forty-three million, four hundred twenty-one thousand, five hundred forty-five".