243201009 has 16 divisors (see below), whose sum is σ = 330690240. Its totient is φ = 158938560.

The previous prime is 243200987. The next prime is 243201061. The reversal of 243201009 is 900102342.

It is not a de Polignac number, because 243201009 - 2⁹ = 243200497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243201509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68539 + ... + 71999.

It is an arithmetic number, because the mean of its divisors is an integer number (20668140).

Almost surely, 2^243201009 is an apocalyptic number.

It is an amenable number.

243201009 is a deficient number, since it is larger than the sum of its proper divisors (87489231).

243201009 is a wasteful number, since it uses less digits than its factorization.

243201009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3920.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 243201009 is about 15594.9033020407. The cubic root of 243201009 is about 624.1971635140.

The spelling of 243201009 in words is "two hundred forty-three million, two hundred one thousand, nine".