243203241551 has 2 divisors, whose sum is σ = 243203241552. Its totient is φ = 243203241550.

The previous prime is 243203241433. The next prime is 243203241553. The reversal of 243203241551 is 155142302342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243203241551 - 2¹⁸ = 243202979407 is a prime.

Together with 243203241553, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243203241553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121601620775 + 121601620776.

It is an arithmetic number, because the mean of its divisors is an integer number (121601620776).

Almost surely, 2^243203241551 is an apocalyptic number.

243203241551 is a deficient number, since it is larger than the sum of its proper divisors (1).

243203241551 is an equidigital number, since it uses as much as digits as its factorization.

243203241551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 243203241551 its reverse (155142302342), we get a palindrome (398345543893).

The spelling of 243203241551 in words is "two hundred forty-three billion, two hundred three million, two hundred forty-one thousand, five hundred fifty-one".