243121243447 has 2 divisors, whose sum is σ = 243121243448. Its totient is φ = 243121243446.

The previous prime is 243121243397. The next prime is 243121243459. The reversal of 243121243447 is 744342121342.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243121243447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243121249447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560621723 + 121560621724.

It is an arithmetic number, because the mean of its divisors is an integer number (121560621724).

Almost surely, 2^243121243447 is an apocalyptic number.

243121243447 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121243447 is an equidigital number, since it uses as much as digits as its factorization.

243121243447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 37.

Adding to 243121243447 its reverse (744342121342), we get a palindrome (987463364789).

The spelling of 243121243447 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-three thousand, four hundred forty-seven".