243051221513 has 2 divisors, whose sum is σ = 243051221514. Its totient is φ = 243051221512.

The previous prime is 243051221477. The next prime is 243051221549. The reversal of 243051221513 is 315122150342.

243051221513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (243051221477) and next prime (243051221549).

It can be written as a sum of positive squares in only one way, i.e., 237321942649 + 5729278864 = 487157^2 + 75692^2 .

It is a cyclic number.

It is not a de Polignac number, because 243051221513 - 2⁶ = 243051221449 is a prime.

It is a super-2 number, since 2×243051221513² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243051221563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121525610756 + 121525610757.

It is an arithmetic number, because the mean of its divisors is an integer number (121525610757).

Almost surely, 2^243051221513 is an apocalyptic number.

It is an amenable number.

243051221513 is a deficient number, since it is larger than the sum of its proper divisors (1).

243051221513 is an equidigital number, since it uses as much as digits as its factorization.

243051221513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 243051221513 its reverse (315122150342), we get a palindrome (558173371855).

The spelling of 243051221513 in words is "two hundred forty-three billion, fifty-one million, two hundred twenty-one thousand, five hundred thirteen".