243665481 has 8 divisors (see below), whose sum is σ = 341986720. Its totient is φ = 153893952.

The previous prime is 243665449. The next prime is 243665489. The reversal of 243665481 is 184566342.

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

It is not a de Polignac number, because 243665481 - 2⁵ = 243665449 is a prime.

It is a super-2 number, since 2×243665481² = 118745733261922722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243665489) 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, 2137360 + ... + 2137473.

It is an arithmetic number, because the mean of its divisors is an integer number (42748340).

Almost surely, 2^243665481 is an apocalyptic number.

It is an amenable number.

243665481 is a deficient number, since it is larger than the sum of its proper divisors (98321239).

243665481 is a wasteful number, since it uses less digits than its factorization.

243665481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4274855.

The product of its digits is 138240, while the sum is 39.

The square root of 243665481 is about 15609.7879870292. The cubic root of 243665481 is about 624.5942804703.

The spelling of 243665481 in words is "two hundred forty-three million, six hundred sixty-five thousand, four hundred eighty-one".