243400340201 has 16 divisors (see below), whose sum is σ = 261450182784. Its totient is φ = 226001850624.

The previous prime is 243400340179. The next prime is 243400340231. The reversal of 243400340201 is 102043004342.

It is a cyclic number.

It is not a de Polignac number, because 243400340201 - 2¹⁸ = 243400078057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243400340231) 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, 38210 + ... + 698756.

It is an arithmetic number, because the mean of its divisors is an integer number (16340636424).

Almost surely, 2^243400340201 is an apocalyptic number.

It is an amenable number.

243400340201 is a deficient number, since it is larger than the sum of its proper divisors (18049842583).

243400340201 is a wasteful number, since it uses less digits than its factorization.

243400340201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661040.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 243400340201 its reverse (102043004342), we get a palindrome (345443344543).

The spelling of 243400340201 in words is "two hundred forty-three billion, four hundred million, three hundred forty thousand, two hundred one".