243112451321 has 2 divisors, whose sum is σ = 243112451322.
Its totient is φ = 243112451320.
The previous prime is 243112451261. The next prime is 243112451339. The reversal of 243112451321 is 123154211342.
Adding to 243112451321 its reverse (123154211342), we get a palindrome (366266662663).
It is a happy number.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 219994769296 + 23117682025 = 469036^2 + 152045^2
It is a cyclic number.
It is not a de Polignac number, because 243112451321 - 214 = 243112434937 is a prime.
It is a Sophie Germain prime.
It is a Curzon number.
It is not a weakly prime, because it can be changed into another prime (243112451381) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121556225660 + 121556225661.
It is an arithmetic number, because the mean of its divisors is an integer number (121556225661).
Almost surely, 2243112451321 is an apocalyptic number.
It is an amenable number.
243112451321 is a deficient number, since it is larger than the sum of its proper divisors (1).
243112451321 is an equidigital number, since it uses as much as digits as its factorization.
243112451321 is an evil number, because the sum of its binary digits is even.
The product of its digits is 5760, while the sum is 29.
The spelling of 243112451321 in words is "two hundred forty-three billion, one hundred twelve million, four hundred fifty-one thousand, three hundred twenty-one".