243120345401 has 4 divisors (see below), whose sum is σ = 243134340852. Its totient is φ = 243106349952.

The previous prime is 243120345373. The next prime is 243120345431. The reversal of 243120345401 is 104543021342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 108834010000 + 134286335401 = 329900^2 + 366451^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243120345401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243120345431) 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, 6971636 + ... + 7006421.

It is an arithmetic number, because the mean of its divisors is an integer number (60783585213).

Almost surely, 2^243120345401 is an apocalyptic number.

It is an amenable number.

243120345401 is a deficient number, since it is larger than the sum of its proper divisors (13995451).

243120345401 is a wasteful number, since it uses less digits than its factorization.

243120345401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13995450.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 243120345401 its reverse (104543021342), we get a palindrome (347663366743).

The spelling of 243120345401 in words is "two hundred forty-three billion, one hundred twenty million, three hundred forty-five thousand, four hundred one".