243121240651 has 2 divisors, whose sum is σ = 243121240652. Its totient is φ = 243121240650.

The previous prime is 243121240643. The next prime is 243121240657. The reversal of 243121240651 is 156042121342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243121240651 - 2³ = 243121240643 is a prime.

It is not a weakly prime, because it can be changed into another prime (243121240657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560620325 + 121560620326.

It is an arithmetic number, because the mean of its divisors is an integer number (121560620326).

Almost surely, 2^243121240651 is an apocalyptic number.

243121240651 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121240651 is an equidigital number, since it uses as much as digits as its factorization.

243121240651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 243121240651 its reverse (156042121342), we get a palindrome (399163361993).

The spelling of 243121240651 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty thousand, six hundred fifty-one".