243605401 has 8 divisors (see below), whose sum is σ = 262813320. Its totient is φ = 224464512.

The previous prime is 243605389. The next prime is 243605407. The reversal of 243605401 is 104506342.

It can be written as a sum of positive squares in 4 ways, for example, as 16801801 + 226803600 = 4099^2 + 15060^2 .

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 243605401 - 2⁷ = 243605273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243605407) 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, 9070 + ... + 23863.

It is an arithmetic number, because the mean of its divisors is an integer number (32851665).

Almost surely, 2^243605401 is an apocalyptic number.

It is an amenable number.

243605401 is a deficient number, since it is larger than the sum of its proper divisors (19207919).

243605401 is a wasteful number, since it uses less digits than its factorization.

243605401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33515.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 243605401 is about 15607.8634348203. The cubic root of 243605401 is about 624.5429413573.

The spelling of 243605401 in words is "two hundred forty-three million, six hundred five thousand, four hundred one".