243636121697 has 4 divisors (see below), whose sum is σ = 243694989360. Its totient is φ = 243577254036.

The previous prime is 243636121607. The next prime is 243636121709. The reversal of 243636121697 is 796121636342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 243636121697 - 2¹⁴ = 243636105313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243636121607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29427623 + ... + 29435900.

It is an arithmetic number, because the mean of its divisors is an integer number (60923747340).

Almost surely, 2^243636121697 is an apocalyptic number.

It is an amenable number.

243636121697 is a deficient number, since it is larger than the sum of its proper divisors (58867663).

243636121697 is an equidigital number, since it uses as much as digits as its factorization.

243636121697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58867662.

The product of its digits is 1959552, while the sum is 50.

The spelling of 243636121697 in words is "two hundred forty-three billion, six hundred thirty-six million, one hundred twenty-one thousand, six hundred ninety-seven".