243681605 has 8 divisors (see below), whose sum is σ = 298639872. Its totient is φ = 190797328.

The previous prime is 243681569. The next prime is 243681611. The reversal of 243681605 is 506186342.

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 243681605 - 2⁶ = 243681541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 518237 + ... + 518706.

It is an arithmetic number, because the mean of its divisors is an integer number (37329984).

Almost surely, 2^243681605 is an apocalyptic number.

It is an amenable number.

243681605 is a deficient number, since it is larger than the sum of its proper divisors (54958267).

243681605 is a wasteful number, since it uses less digits than its factorization.

243681605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036995.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 243681605 is about 15610.3044493053. The cubic root of 243681605 is about 624.6080571941.

The spelling of 243681605 in words is "two hundred forty-three million, six hundred eighty-one thousand, six hundred five".