243535320551 has 2 divisors, whose sum is σ = 243535320552. Its totient is φ = 243535320550.

The previous prime is 243535320541. The next prime is 243535320557. The reversal of 243535320551 is 155023535342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243535320551 - 2⁶ = 243535320487 is a prime.

It is a super-3 number, since 3×243535320551³ (a number of 35 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243535320557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121767660275 + 121767660276.

It is an arithmetic number, because the mean of its divisors is an integer number (121767660276).

Almost surely, 2^243535320551 is an apocalyptic number.

243535320551 is a deficient number, since it is larger than the sum of its proper divisors (1).

243535320551 is an equidigital number, since it uses as much as digits as its factorization.

243535320551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270000, while the sum is 38.

Adding to 243535320551 its reverse (155023535342), we get a palindrome (398558855893).

The spelling of 243535320551 in words is "two hundred forty-three billion, five hundred thirty-five million, three hundred twenty thousand, five hundred fifty-one".