243641409 has 8 divisors (see below), whose sum is σ = 354387552. Its totient is φ = 147661440.

The previous prime is 243641401. The next prime is 243641417. The reversal of 243641409 is 904146342.

It is an interprime number because it is at equal distance from previous prime (243641401) and next prime (243641417).

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

It is not a de Polignac number, because 243641409 - 2³ = 243641401 is a prime.

It is a super-2 number, since 2×243641409² = 118722272359010562, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 7383073 = 243641409 / (2 + 4 + 3 + 6 + 4 + 1 + 4 + 0 + 9).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 243641409.

It is not an unprimeable number, because it can be changed into a prime (243641401) 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, 3691504 + ... + 3691569.

It is an arithmetic number, because the mean of its divisors is an integer number (44298444).

Almost surely, 2^243641409 is an apocalyptic number.

It is an amenable number.

243641409 is a deficient number, since it is larger than the sum of its proper divisors (110746143).

243641409 is a wasteful number, since it uses less digits than its factorization.

243641409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7383087.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 243641409 is about 15609.0169133101. The cubic root of 243641409 is about 624.5737116580.

The spelling of 243641409 in words is "two hundred forty-three million, six hundred forty-one thousand, four hundred nine".