243645161 has 8 divisors (see below), whose sum is σ = 250186560. Its totient is φ = 237184272.

The previous prime is 243645137. The next prime is 243645179. The reversal of 243645161 is 161546342.

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 243645161 - 2¹⁸ = 243383017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243645121) 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, 13970 + ... + 26123.

It is an arithmetic number, because the mean of its divisors is an integer number (31273320).

Almost surely, 2^243645161 is an apocalyptic number.

It is an amenable number.

243645161 is a deficient number, since it is larger than the sum of its proper divisors (6541399).

243645161 is a wasteful number, since it uses less digits than its factorization.

243645161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40255.

The product of its digits is 17280, while the sum is 32.

The square root of 243645161 is about 15609.1370997887. The cubic root of 243645161 is about 624.5769177202.

The spelling of 243645161 in words is "two hundred forty-three million, six hundred forty-five thousand, one hundred sixty-one".