243249409 has 8 divisors (see below), whose sum is σ = 268053632. Its totient is φ = 219315600.

The previous prime is 243249397. The next prime is 243249431. The reversal of 243249409 is 904942342.

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 243249409 - 2¹⁵ = 243216641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243249439) 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, 217017 + ... + 218134.

It is an arithmetic number, because the mean of its divisors is an integer number (33506704).

Almost surely, 2^243249409 is an apocalyptic number.

It is an amenable number.

243249409 is a deficient number, since it is larger than the sum of its proper divisors (24804223).

243249409 is a wasteful number, since it uses less digits than its factorization.

243249409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435207.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 243249409 is about 15596.4550138806. The cubic root of 243249409 is about 624.2385684118.

It can be divided in two parts, 24324 and 9409, that added together give a palindrome (33733).

The spelling of 243249409 in words is "two hundred forty-three million, two hundred forty-nine thousand, four hundred nine".