243113451521 has 2 divisors, whose sum is σ = 243113451522. Its totient is φ = 243113451520.

The previous prime is 243113451487. The next prime is 243113451527. The reversal of 243113451521 is 125154311342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208017175921 + 35096275600 = 456089^2 + 187340^2 .

It is a cyclic number.

It is not a de Polignac number, because 243113451521 - 2¹⁴ = 243113435137 is a prime.

It is not a weakly prime, because it can be changed into another prime (243113451527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121556725760 + 121556725761.

It is an arithmetic number, because the mean of its divisors is an integer number (121556725761).

Almost surely, 2^243113451521 is an apocalyptic number.

It is an amenable number.

243113451521 is a deficient number, since it is larger than the sum of its proper divisors (1).

243113451521 is an equidigital number, since it uses as much as digits as its factorization.

243113451521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 32.

Adding to 243113451521 its reverse (125154311342), we get a palindrome (368267762863).

The spelling of 243113451521 in words is "two hundred forty-three billion, one hundred thirteen million, four hundred fifty-one thousand, five hundred twenty-one".