243121122509 has 8 divisors (see below), whose sum is σ = 244899848832. Its totient is φ = 241344615600.

The previous prime is 243121122479. The next prime is 243121122521. The reversal of 243121122509 is 905221121342.

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 243121122509 - 2¹⁶ = 243121056973 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243121122599) 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, 334649 + ... + 773454.

It is an arithmetic number, because the mean of its divisors is an integer number (30612481104).

Almost surely, 2^243121122509 is an apocalyptic number.

It is an amenable number.

243121122509 is a deficient number, since it is larger than the sum of its proper divisors (1778726323).

243121122509 is a wasteful number, since it uses less digits than its factorization.

243121122509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109707.

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 243121122509 in words is "two hundred forty-three billion, one hundred twenty-one million, one hundred twenty-two thousand, five hundred nine".